Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5974d9b978b1ed…

MALICIOUS

PDF

76.3 KB Created: 2021-06-13 11:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 765fc413bbd6325c53307ff97cbf8295 SHA-1: c4fe0cc1a7186389fe2558f18252c20f566208b8 SHA-256: 5f5974d9b978b1ed6a7908a6a359df6c6272218d0bc830b007f99362b12b1bcf
176 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to song downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=parayathe+ariyathe+song+mp3+download PDF link annotation
    • http://www.siscbolivia.com/admin/uploaded/fck/file/watusulosivovujejomizosi.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/18467742667.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a0ad2fc5---fupitakuzeketuragajakux.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/32441215114.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/vukexatiwalugafurafijaxu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/44m4juo4tsi1qkij22kifc1dfm/vudoxojitodumuwefarota.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/43478504250.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/vixedokafa.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6b5aeac5---90230652312.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/62925816057.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/zitadokijajezal.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9277503f7---24252031524.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf339dc5dd2---36174644381.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/f76kib6qkat10n2lks2nvvdo74/99205659756.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ol5b4pmd46oa7dba5h4q8dndjr/75653304859.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffa2aa2175---10612972317.pdfPDF link annotation
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/baa176c73a02d71788fdb2cc8b8d122c/baduf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 5732 bytes
SHA-256: 46a06ff8bdfc1693a11c835f9a0500eb225dae9594ba36bc66cc3378ed5b6df2
font_01_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 10716 bytes
SHA-256: 5dba86638f80df26c11512d029f264fd79f1ecf6dbea7820f17a82cd8418059c