Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3bf595233ff18f…

MALICIOUS

PDF

91.1 KB Created: 2021-08-09 23:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ceea3a9daaa4c7546627e58dc76bf72 SHA-1: 46b38194e9a31a595f5b36af13b761ce2809dda2 SHA-256: 8f3bf595233ff18fbfdbd50cfd7d54aba3f5b87ab7b16ab814209ade7e4fa339
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are compromised WordPress upload directories. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983d51dcb95---10488154660.pdf In PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/487a5c6b4b72q7ocbe1ehj0971/panobexemosakamaxabu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959fa4035f9---53313920365.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/87800015915.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076abf61d779---topalojokujam.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081660ff3533---26978956774.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/da45kbjl8snppajt3mlvka1ojt/77660624450.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0be4c2b9dd---58434759022.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9df973f586---9058208051.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/xapowadekewupatebi.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/dizodivemopulixozajatabad.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/nds5qqp945coo8rh9b0noml4g5/20263372871.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/42532749308.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/jevamo.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/16516855430.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c55f40d72df---kadaremu.pdfIn PDF document text
    • https://gilbertems.com/videos/file/kivepetafunubipojunejo.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/65683402737.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d18e4e13bc3---dobejalanubulag.pdfIn PDF document text
    • http://nfc.soo.jp/file/29087270962.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/85e91dc6e3b817606eb6265bd969dd2e/dogesudiwux.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c2b04ac1b---10023083891.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95e0700aa5---bixejebozuximubikefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=whirlpool+reverse+osmosis+not+workingPDF 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_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 10776 bytes
SHA-256: afdfd6ed01893a9a008c9e00da29af33ebdfc8352554ff9d63b570abb0a06973
font_01_sfnt_off00011758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 17044 bytes
SHA-256: 6e2ea8091aa5cc584c57b3250cb8bcfedc4816d1a5b67b8cbfe6ab08442c4cfa
font_02_sfnt_off0001441c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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