Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4dbf74784c0e4fd…

MALICIOUS

PDF

85.2 KB Created: 2021-10-13 10:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e02efff4ed7087b7a2858bc896c5fe84 SHA-1: 037a40be9078612a4ea6f15fdb2413dd64310fd7 SHA-256: e4dbf74784c0e4fddc9f143ac8ff0abbda17760322ed11335e424690255e9a51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other domains, indicative of a phishing or malware distribution scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent. The ML classifier and ClamAV detection further corroborate this, flagging the file as malicious. No scripts were extracted, but the structure and URLs point to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138f193c12b2---90353271616.pdf In PDF document text
    • http://cappellastudio.it/userfiles/files/51886800750.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/61084125736.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/82058764031.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/wetekafa.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/051445591949.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/madit.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/vidoweful.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/89854423116.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/vofikonuzawajiri.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/46208977214.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/15195004225.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3544e981a279b7f7dc1f1868a5264239/mevukivubowidi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/83ade8bbed74b5a38947cde8ce10fbc8/96483151762.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/pasorarelinifubasefizi.pdfIn PDF document text
    • http://cwesp.biz/upload/file/92829472594.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/24685438555.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161644120356e1---46862090230.pdfIn PDF document text
    • http://ilovestory.com/upload/file/89727172322.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/kisikamabosigema.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7eb146a9dada1051c82723d25975a8e4/43796102899.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/wixozilakeketimopuje.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/6240364230.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/daveruganomafagar.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RhDyTiV0TgQ/uplcv?utm_term=trooping+the+colour+2016PDF 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_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 19768 bytes
SHA-256: 1350f49ca4843671f4f598ebd911420a0dec78b5bc576f00cfe06b1989923541
font_01_sfnt_off00011609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E20 10848 bytes
SHA-256: 6bb2cc3865e01e49136169d08661e4c3ebe8d76fa757d53833f587772b283efa

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