Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a343ab083e25c7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 08:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b0dfe93d4f67479d85c9ca262c19be8 SHA-1: 7934313e3124a478d34f6bc8c10afede60dec503 SHA-256: 44a343ab083e25c7ad09b304250aea1b70968c4a0c2b4bd4bf50e68480d2598f
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to download PDFs hosted on compromised websites. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5556b183da---mukekeguripovusevirubid.pdf In PDF document text
    • https://dursunguney.com/userfiles/files/putuwubiwikuwesowarigib.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/46f6dafa9367896bf5cb96042de25ea6/negalelisuwu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160772658827b6---tuwinam.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/mg1gbnodvpv5bbbmfefvgh3kq8/kovanidolitifasovizesa.pdfIn PDF document text
    • http://sushibelovo.ru/files/xejuweke.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573b88294c---74090878438.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/28372258394.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607cadd4ecb13---68754051204.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/57844726473.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210815081837.pdfIn PDF document text
    • https://506hlapeta.com/files/file/86197073537.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a0f74c883---ladigaxarinakev.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/12825632703.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2b2f2d9b---kizij.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/54293a1931e90f5a658820ff557cae51/juguwerov.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/gapoberagepotawomizesi.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/33729489569.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee70cbd0ced---gekufa.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf745c0e45---6688313247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=usmle+rx+qbank+2019+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD471 19564 bytes
SHA-256: c0c95f5980aaa522f402fddfac12a8de4ddc8ec7276746e6cb5f95fc04c11832
font_01_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 11296 bytes
SHA-256: 183e30ee7f7cac02a46fb2ab0ff7387735a71a69ebcde116d074ee0577f02e2a

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