Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa7126e97b30734…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 21:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8618dee3e7087025835450e4e607c8bc SHA-1: 515faab772ae0a7f4acc03f717a8125aa1f5750b SHA-256: 1aa7126e97b30734e5fbb74d4cf24af7f955fa61ba19c2f25174ffee140535b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of these links indicates an attempt to leverage the document for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff809af89---20888510131.pdf In PDF document text
    • http://ehomeforeclosure.org/images/file/992979544.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/4hteprvt4mmlbrv2l0fv23o9jn/xakuzujatoxakelolomaj.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e598780bf2dc08be3439cf46d9f16385/megizubozasireniza.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160842843da67a---nikoxadevororixotojisoka.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/r6r5ma60fgcadjosjbr43rvj8i/vedizupejozozol.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081e5c508d61---99875824322.pdfIn PDF document text
    • http://medi-sen.com/files/files/28636681503.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/l7gh1rfn1uu3tvj5iamvjlgmn6/4104581685.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/26508299951.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/tufawofafelis.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e31143568a3---kejufumivudig.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/db2a7rfmlefjkpm4klkc1d3bc3/27776896944.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/45970357860.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/kurowobapopojuwaraf.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/655e00ab76b81f81c6b4c2691d059718/kidoperovam.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/fuponemewaji.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/5487247354.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d3eea43dd40c28b5f5f62a5588bed43d/18446232124.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/vizosekelezeg.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c874e42e1f5---letakojaf.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b78a1da3e---13934599935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=oxyhaemoglobin+dissociation+curve+pdfPDF 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://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_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 11616 bytes
SHA-256: 137a4776e5f63e0006b319656217ab686eb2765df4bdeb949e60b3c51ce20e68
font_02_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 18356 bytes
SHA-256: cff467d565707403fa287f004574325964b921cfa540d1b1dae77460923d7207

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