Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2cfe862cc2948d…

MALICIOUS

PDF

98.0 KB Created: 2021-09-05 10:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d74939ce814c019ee1e8c62030982db SHA-1: c3889b1d173769c433ba6706717c69026d28e1f3 SHA-256: ab2cfe862cc2948dc7b4996a065eb41bf2beb9226cdc32a1487253ec4f06cecc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the nature of the link farm and the detection as a Trojan indicate it likely serves as a dropper or redirects to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/jcpgmgeqqgrd7jh3vesh6mshk4/37572421595.pdf In PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093a413bcdde---99612061912.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/54761561404.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/zifizuxofanusuba.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a668b33e18b---7291891571.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/zufujavupigujamajurav.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/digejetavafavibexurop.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/butoxiziramuvigunapad.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/68620127515.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/kugewaz.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7b078c08c365b73d0113db8f5007a5fa/4494019266.pdfIn PDF document text
    • http://amdind.com/userfiles/file/nasonobigasebiwavobojinu.pdfIn PDF document text
    • https://fallsplat.se/file/76494231671.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1e8aebaa3e7316e6ed7096e8f3e724c6/gagelopunufalokexawudeg.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/62880959577.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dc40610a---12696697739.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/1474235708.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/jekonu.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/vokivonoloro.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/89264386660.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/pavipuratemutoza.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608780a71d74a---65344947137.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd41bfd65---93640347412.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b59be8c1ebf---99876420607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=niv+bible+concordance+pdf+free+downloadPDF 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_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 10616 bytes
SHA-256: bdef5b37200cb9b10e79c79a937ad8964a50c31fa06501349e24774ee132b890
font_01_sfnt_off00012cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14500 20048 bytes
SHA-256: b5821a0f4e66e5dcbad056cbe10335ccdb9af87c319d041b2f47f701ca925777

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