Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac73bb44854dec7d…

MALICIOUS

PDF

74.9 KB Created: 2021-08-31 03:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0df64a1f5404ca6f85280a73d5516a60 SHA-1: bbecebbd2e46578a07e9afb2e16803d1c94f2986 SHA-256: ac73bb44854dec7d0aa55db7cbd6df49f4552d5887efba44ef197f843141bdd6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data, but the heuristic firings clearly indicate the sample's purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://brickchamber.com/ckfinder/userfiles/files/jabanatanex.pdf In PDF document text
    • http://prplus4u.com/ckupload/files/84185489015.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e64267bb9---pefagivolil.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d907faa0215---88983358686.pdfIn PDF document text
    • http://sushi-belovo.ru/files/bofelazabasi.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/8367996431.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082190dbcacf---jixajamizidopolun.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b2c2d632---7127018736.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afde2e8e199---kexarenajepudebalo.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/24681871477.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/lizimibiv.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/cfa8d279a2d64cfeb4d0a8e96e5f183c/xewunejebepapiz.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7f85507c1e8cd22d10cb7e80b7ad1d1a/91084525409.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/42451789107.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/dazubesirasog.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/56243250819.pdfIn PDF document text
    • http://houselandia.ru/files/fizemarogaxakesulan.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/toluruzowu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/46614b0310d96c2e951bc74e7982bb10/rikekeluduxijafofopazez.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd50b2ed219---jufomovunivekipuvo.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/43456196170.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af967fa2cd1---guburaneveni.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/72760166782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pharmacotherapy+casebook+answer+key+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_off0000c20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1F 16212 bytes
SHA-256: 5cc3beed33c711e25aa3d2612a180f4f6f1d893b228749dfdef2a507d3af415f
font_02_sfnt_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 11180 bytes
SHA-256: 0fcfcd654d7f071e5e4cd0a455c3ccf735adfbfed3adc6ca4ab920c46ab1ea46

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