Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0b8ca7bb781503…

MALICIOUS

PDF

117.0 KB Created: 2021-06-12 08:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b17b1e137026dc3d5b8160674d8b9768 SHA-1: 1d575247b4ee912a5bb1512a3fd68f8988b0f46a SHA-256: fe0b8ca7bb781503c6a7a63733c2603b791d1345cc6fe1f6fe579acf724ba1d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=imo+premium+free+download PDF link annotation
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60aea00849---fidefonax.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/395ef09ba75f8f6fddb4be3b3518a2a9/69883381201.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/842to6ro4sm8vl0unggstv0816/riwalebusinowa.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/71m57it086pveojos27b7223hc/rexukojozifun.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/vumodiseze.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c2af5a320---vefixufarovegetefelit.pdfIn PDF document text
    • https://davaocarrental.com/images/file/95735063117.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/relewaxir.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bemes.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/mikasiriwige.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/tabipaserisuz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lbf3b6rf68ob29d4hvo2o62bp1/xenusabibumurokuxupew.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7952b19d85---xizudejabuvifazewiwaje.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/20743f3021c5fb8cd164fde305777ff1/vamekexigeja.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/mo3r48pthefq8008ub4gplacp4/87850940859.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea954c153---4143928499.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7de46ec0b705fb2d66b3ee59a8e89e34/kuwojifudifijigofoginak.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001846e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1846E 5040 bytes
SHA-256: 18042a15beee5db5f66776cebb5210856de6c252fde115534e8a473e966001f6
font_01_sfnt_off00019588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19588 1964 bytes
SHA-256: 3974e200c5d9c8f30123e1eac38fa50876741fee3be316e840f85b529713d3bf
font_02_sfnt_off00019e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E94 11564 bytes
SHA-256: 70c3862720a07646ef1bc9b3ab59b88c70d80c0f7107961d9fe8e69e39b3b399