Malicious PDF — malware analysis report

Static analysis result for SHA-256 692e222bfacc3cc9…

MALICIOUS

PDF

104.5 KB Created: 2021-07-14 06:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98226c1dd0201b9ae9e4289c632ec6e9 SHA-1: 999be70f63f1dc5dad1d53a6e1c8596d19917c8c SHA-256: 692e222bfacc3cc915543e575c87cf720819f17f9a368e865867a6c6618f8149
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDF files, many hosted on compromised CMS upload directories. The ML classifier and ClamAV strongly indicate maliciousness, with the link farm likely serving as a lure or a distribution mechanism for further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.hgbehringer.de/img/files/files/faveponabozugove.pdf In PDF document text
    • http://easyreturn.store/userfiles/file/gulaguvufolo.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608435fb33d79---tiwivi.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/4163508794.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/18508481211.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/xexujizujenizomipiguki.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/27228676069.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/mgcp2m8nag473g233g502d2176/nusinozosoduwujez.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04511ccae408df206a5accffe768a6a0/23140300700.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc1bd983f---60266518031.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e929872b620---3101665329.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee6edcdd9---lokuroxisinufulorarafafax.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/sewiwivovop.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ha3sa0ru8f9s58ha54b0e5t32j/lijoxif.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/56017795174.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/36564369982.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec75e1d4ce---sipusuduzolowetefukivedo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ff1ad4357---49543345674.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/316928cfd4a4f5b0f0a616d3c1b1160c/67613764118.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/tibolawepivetameju.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a6713495---lanubejatobemuxoxoju.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/suvaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+metamorphosis+chapter+3+summaryPDF 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_off00013af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15303 15816 bytes
SHA-256: 99f35e95cfa923a35f2e5f0a92687cf40e3b1fa378b3b6b171cb35bd766394d7
font_02_sfnt_off00017b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B4F 10836 bytes
SHA-256: 9cd185b197b769fe824e74036626e1e0e7eb31737c75b4b80d032fa9ade96b65

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