Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41f195062db13cc…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 10:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9dad2cd5b2b49c598c734a7e01cc211a SHA-1: 3701e473dbb7d8ceae42f52aaeca52d829737a50 SHA-256: d41f195062db13cc08bd32361ab7cecc0612cfb3f665ee5f5cb18601c24c71fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kpghomerepairs.com/uploads/image/files/95354790070.pdf In PDF document text
    • http://denki-shonan.com/uploadsfile/vejetejeje.pdfIn PDF document text
    • https://deepex.hu/hirek/files/rovakugerivo.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/83870421749.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/vejejupagimafupi.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wigemin.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8c90799cf1434b11a8866b54441f0e84/nukoleruwedowexo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613459a8a1bb0---xofoxaxudisikuwupiniviga.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/gaferadefedofotubone.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613782df992ba---kezewowixavepa.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6858dc015---22052139730.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/xosejazaw.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/memegeduzixok.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/jesov.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/15246741689.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/97790826409.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/45386090411.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/3c3816fb75ace0bffd7361e21af4f060/fanapexuwatuz.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210914_101407.pdfIn PDF document text
    • http://terminsk.by/pics/files/tozavuzidazivirasuganuna.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/23314987081.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/tewuvok.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/32075752178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+young+pope+full+episodes+freePDF 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_off0000b382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB382 10692 bytes
SHA-256: 2aef03cbd853a41ec20e63584d966cc831544bde105b9f5ee47c9e55379ec651
font_01_sfnt_off0000cbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 17292 bytes
SHA-256: 36d7b7fa1c9dd32e13f55ae79b3ca3758fd19e01c57deca9ce30ad61cada482b

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