Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39da3038b3ce9c2…

MALICIOUS

PDF

98.0 KB Created: 2021-06-20 13:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8229e632088b804a4e0b6ec45f95c3de SHA-1: 09e6c5bea05a64999b1f4c3c58ec62ab1b18c2d0 SHA-256: b39da3038b3ce9c2acbb84edff2f955296cd0bb058f2219b7832b355fcce560d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf0c526528---duputabapagukimi.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48e3c4fe1---29239872845.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca3fddd20---wopenikiwowodu.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/cd70097d497b8ac1c9271ebdf72b8852/tinufozidubojug.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/lakidexazeje.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210601111502.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e0b4fda9c17e0e942a4f3e3a764982c8/41638651584.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e2260f4d6---51768689866.pdfIn PDF document text
    • http://petrduchek.com/files/43232748952.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/56225902617.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/67304888043.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/22323165615.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f115128a14---gavoxixofurekalozejavedep.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4678b0009d36a627240400f7e16108d2/63015370427.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92ef93df2---73856671459.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/61950777675.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/862ad63f1b8ce99225872397fa999c04/fororoxafebuwojokupukerif.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9afc36c093---xatipekefunebozodajaw.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a7fbcc1bf66d1a2b772c57601307af10/2941197611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ilayaraja+old+songs+1970+to+1980PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 5732 bytes
SHA-256: 5be667b63cd337c9f1d907aa806dc9cac6e5f261abd51a1c6a16d4bf22c59776
font_01_sfnt_off00013736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13736 11168 bytes
SHA-256: fd252fa23dcaba0c1256a9b1712d29d3bba98d15068e5357dc4e9b0127b05364
font_02_sfnt_off00015419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15419 10712 bytes
SHA-256: 533fe8bc085d0623e19c7698279ff77be1635698967e663f9caebdc7dfb37525

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