Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6e28a09eef58aa…

MALICIOUS

PDF

93.3 KB Created: 2021-09-06 21:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e06a5fd514b669667c35435d9a11aa3 SHA-1: f57a36b999acafdb1cafa46580f7f1864a6b1695 SHA-256: 7c6e28a09eef58aa14cefebb43f710c998d7731431026412d9415186631dc26b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://eprdel.cz/userfiles/file/80150724803.pdf In PDF document text
    • https://eletvital.hu/uploads/files/zigunemivuvaxeji.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38604396576.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/37091383022.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/29344377997.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/51848023778.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/fumanebumatexuko.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608b607a6823b---40431030411.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/vanugebom.pdfIn PDF document text
    • http://szcftz.com/upload/joxiruxukowivogonalutozo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ut8vs8h4ekvi48f35knnm5f31c/zanowageregidire.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/19017503886123e71f706a4.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e33a41c6114---sekelaxelalevemela.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e636da360977f2835f0ab6c751d50d85/88437961600.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/95202877196.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ulfqahc3d1t6419t9ljpehekpb/fasuxuzokevirelujonozif.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/nizofokonomepivorojul.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076715c17fb2---rusufujomewiwoxudopuv.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc975d59a0---43397251273.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608863733119e---likamozukejuwetebopebibiv.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded4f8504f---78106317140.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/3547612371.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089348d73d8f---tajusu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161292775e3eef---3829157030.pdfIn PDF document text
    • http://bociany.sk/media/file/zepoveduvugiwirusotaxe.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071a614b623b---minuxukomivagol.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b3ab0b1e---14044826092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=smoke+on+the+water+guitar+solo+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 19492 bytes
SHA-256: debb8f1ab307dd197d1b5f74ac21e95aecba71cf42eb2ba85f00f76af202b210
font_01_sfnt_off000134ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CE 11296 bytes
SHA-256: 37bf868c3772126e2cb407a661d8f1f482f8a2859ed481396f432b47b53e4493
font_02_sfnt_off00014efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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