Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a8c324f3b44507…

MALICIOUS

PDF

96.1 KB Created: 2021-09-08 03:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63866b990a037a46468e510e1adc3e70 SHA-1: a51332cc271f94555f70e7da54dc951d15550ee6 SHA-256: 30a8c324f3b44507c4d7c5f600d7f649fdc0622300c2f646bde5c97307857ea4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://oniceh.ru/uplcv?utm_term=machine+learning+andrew+ng+coursera+pdf PDF link annotation
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jfgp2oeuhnmg4ek5b4lc38muhh/6952631299.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/51599475483.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/cdd335b920115d2291f7620fcec58b58/55978805721.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/gatekulovewakamagulare.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608596892e87e---fatefowupibirubip.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/iprtj9amk2kcaj73457k55a28h/xukiwasexo.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/id3epju00ijlpucu77q2qjtgq3/45034653423.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/malarugu.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/sojanoniniba.pdfIn PDF document text
    • http://llux.vn/uploads/files/rujazimajiritavopotakise.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/86885507139.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/fuzukaxujemetuw.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/xuzalebokof.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/27093520818.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202108162253598749.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8373242a66---63091907254.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/wiwekudomo.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/lavivelili.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab991199e9f---vejubedepifidibojeserirad.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/xukunew.pdfIn PDF document text
    • http://stromzeleny.cz/file/99733509420.pdfIn PDF document text
    • http://medrea.ru/upload/files/28168858091.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/vaxotobewolek.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7fmr9rr147j7vubuos1dg3alg0/kaxofonibenekawi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acdb329035---tosomofadiforoponudobope.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_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 20264 bytes
SHA-256: 76d6984104f7e2de4327cbf9fa8bad6d7a6ff171c18e277f1700a06586b5c517
font_01_sfnt_off00014191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14191 10980 bytes
SHA-256: 19f09eb4740f7c7506179ce00c0a6e09c92ca94b2bce5f15d08dbe949d49dea3
font_02_sfnt_off00015ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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