Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a6958f12b3375c…

MALICIOUS

PDF

76.5 KB Created: 2021-06-19 20:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f948b0aa7d04660a852305dfda96666c SHA-1: 72baeae8846c6f97d9a97faa4ae31b48b257ebda SHA-256: 04a6958f12b3375c59deccb083d0ed3183dc013e8f1b65758e0273ebb9668b7e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs and the heuristic findings of a 'link farm' and 'compromised CMS upload link' support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607068922e16b---80807255079.pdf In PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/s8gtp7vh1k6nrfi7543epv2glt/koredoka.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7r788ji1171bs3pp11f1od466i/mofomebazebegotutodavum.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file/%5C/17482425160.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9d19c0c0---83933771679.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/58hmt7ns8liuu19u86rv9e2f23/51027993925.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3ba57d8922d582950d806dfd1ee1d8a2/pejegozupedegujugu.pdfIn PDF document text
    • http://soles2walk.cz/data/file/vitezabunewovoj.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a169e35bc---kalexijitadevijatufomav.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8452b687267ef4b21a6ce06e45fe17ec/73008300125.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210619170526.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/33jsgpnq17rmmcfuhgul12t6ir/94249074810.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/xulunokozufivutezuwevir.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/firutikegupikuvob.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7252bd38c---55731719657.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160be721905986---tarotuwimugozewinure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+tame+a+tek+parasaur+in+ark+xbox+onePDF 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 5256 bytes
SHA-256: bb663ef2b62956792c086f2fca4d8e130fba85699a79c4b59988b8db79d75740
font_01_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 12148 bytes
SHA-256: de77c7a1b0d880998657e115a6c5b3446fa7c9f08cf06094aa030e113581e36a