Malicious PDF — malware analysis report

Static analysis result for SHA-256 807aa6f2dd970f56…

MALICIOUS

PDF

88.7 KB Created: 2021-09-11 05:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1c92bcb1f99660988676341fb86deff SHA-1: 2c76515dbd3023cc85fe49e97f0306f892dfd26c SHA-256: 807aa6f2dd970f563093aa5673820f539af15496ab448276999f388e56872997
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=world+best+video+editing+app+for+android PDF link annotation
    • https://kiptep.ru/file/43764317980.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/11d2nrb4ph1fgae6ic8loa2pr0/dijuketirorobibis.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/gatovabixatokilax.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613078e64ecab---suturapukasizagijenozolel.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090302005973499.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd2cc0f27---saxalokumowozewimojejarul.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/sonetatag.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109060328272454.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/608715779.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/52355974552.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/20oqkjlpnpk664vv61q5qf5s87/zerobofisaxolumisevezadi.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/14692516417.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/81255731342.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/60126744280.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/zepijefexiruwesusaxogerib.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613841505211c---lulipovarali.pdfIn PDF document text
    • https://mackbeks.com/files/file/nuwedajopizosenevulika.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/nirere.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/romezefovurexutufimulok.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/tazinefawenefor.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/zobizipuza.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906222919.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/34719196963.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/fekaz.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/toxigokazofajerizigapu.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/begujifupubu.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_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 10872 bytes
SHA-256: b7d1bfaef94b07b41e12bcdba0fbe271b21b564aed6ae9585c7df315cc8343d0
font_01_sfnt_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 17588 bytes
SHA-256: 8c9747ebf410b7e62fd87fdf2bca6fc04897668b0151e9e87204bcebe3205fec
font_02_sfnt_off00013c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1