Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb8d2a0f8641643…

MALICIOUS

PDF

66.1 KB Created: 2021-06-18 07:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 244096b47780be5c5415be71a1086320 SHA-1: 286035acd97b79aafc6e49a249a42cc35420b26e SHA-256: adb8d2a0f8641643ff98b592d0a888e95a08e15179145433894dee5f718c6ded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm designed to attract users searching for specific content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution, by presenting a lure for a 'free download' of an economics dictionary.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609661d9e6dfa---voroporada.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711706be1b9---tuxekigumeruw.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/7111f6f43a36879f2522ecac02be0d06/32149522333.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5f75698b---12982307981.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/jutizirobejexew.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/mepufiwamepunolegiw.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/20038576275.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9d18189bb429cdd502accec54cbd2aea/63871782087.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/18395a194d87518053886657d76c5a2e/vuguzex.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/85873103372.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/juxopigijuvasi.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/l1d3q82sm0eqjer633mu57lvl1/86417576862.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/sadarewonokelul.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/t32lqkbmb9vg8l6p481mifhkhs/84502602958.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/zevidijegipetavupibo.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/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=oxford+dictionary+of+economics+pdf+free+downloadPDF 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_off0000c27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27D 5592 bytes
SHA-256: 2837b16affe4df9296e7e0ac598d110b5ffa06a9c29bc4283d1641841838b62b
font_01_sfnt_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 11240 bytes
SHA-256: 7d70aa52a25c8e96d15207e61608a3f5dd2bfc54070bd29f03df60d77fb0d248

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