Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11684aa0ecb37a1…

MALICIOUS

PDF

86.6 KB Created: 2021-08-13 09:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dbd3df3717f337409b16c9d4b4c435cf SHA-1: 85836e804338bbbbce20508d0b5d55058288af9c SHA-256: c11684aa0ecb37a1b4bca557d9f51d6f51e2da9af91e28dd36f0b6d24c9c0939
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external URIs, many of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous links suggest it's designed to lure users to malicious sites.

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 https://synerhu.ru/uplcv?utm_term=mckinsey+pyramid+principle+book PDF link annotation
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607040b7e9147---talenovivamenarenazujogav.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67a6d4853c---rugigo.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/5b5427e185ec9ad2d23608ab7097bdb4/58383430485.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/vv98mbv1nvn3sc1dbrh21714e7/gaxonuw.pdfIn PDF document text
    • http://w-mill.jp/images/file/dekojobumekalutuxabote.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757b5fcfe2b---wexovazapevolomasit.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/07d8d3d053a88c7b365d4ec9f8f83c5d/dirabexujateb.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/24042526534.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/turmtsf1qr71fn2u12b9iqlnr2/dajitoxubanomupunudef.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/8435739153.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/80239731871.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1tb10j2m3ol1thr0r9mf4qr694/12018877387.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0906aa73c---zebemodanananofunogov.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/garunirerawaxonojajebizo.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/kikegifamo.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/32907055696.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/64643910395.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/5579012560.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/kabir.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/banejesinilifaz.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/tixoga.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160dfaecfd60ce---42943052580.pdfIn PDF document text
    • 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_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10916 bytes
SHA-256: ed2a88402e2ac9de745b8c9028b3bb0e85e9eb89b4d114d1929fa6c0f1477f00
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 16940 bytes
SHA-256: a111b1d3bc3cff8aa2d64b025a6188ea49d2eda93c446009120cb546ef850a37
font_02_sfnt_off000133d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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