Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e9fdd99e52f1ad…

MALICIOUS

PDF

88.6 KB Created: 2021-08-01 00:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 2fb8fcee7f19acdd39c6cecce5ba4da6 SHA-1: ee87b7d2d10bfe0133a39f32b1cc511f6e4d67fa SHA-256: c9e9fdd99e52f1ad2156f39a5e2f3e69731614dc9b436952ef24be3b434813e6
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document is flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites. Notably, it employs a social-engineering lure to prompt the user to install a browser extension or update, a common method for distributing malware or stealing credentials. No scripts were extracted, but the embedded URLs and link farm structure suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bjjiffy.com/upload/vekewagaxeri.pdf In PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/giduxetegalo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160882a43d5bad---notajuvuroxizugolar.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/33741275260.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8705e50b64---60668875480.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5da64362f8---nimoxanesopajajelop.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/genakafijatosebivigerojip.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/77a9c3bded40e93ab7e86ad2cb281f77/rekova.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/zadezujutitanubeniginabe.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/64573645225.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17c7c95388c46e4eb6a685d4fa074462/diludiwagomugabepifu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7db46d26c94bb7bb3aef12c5a11a65fc/pajapawesusu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/r2gbe6s8ovi2qk8f1dnj83u7gs/90724205697.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab71f4a63b---jexeluzali.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c760392efb---wumeganofutonifizenijor.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/77955587547.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/90551232717.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc55c2281---45714679261.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/dodusukezig.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/985460a7bc2c7b7cbc6f755b221e4021/gutaxujedezixudex.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/migeladixupi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ccfdeb420---42444066818.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060800213773.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/98232028243.pdfIn PDF document text
    • http://splogservice.ru/content/file/65139086845.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/lugazubilamovijuzusefusaz.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc98f078df---18676485911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+renew+trade+license+online+in+dubaiPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 10680 bytes
SHA-256: bb28caf5cdb7c11944cc8e08f285d41a510d8713a75caf2fe8cdcf92e9cf436c
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 16972 bytes
SHA-256: d15b5c0c49522466a8a8a17375e02c3b72b1cf9b155c4ffcff324908d03f321c

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