Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91f78e4388f6de4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 12:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9aa8f42261617b8ef1255077b551f28 SHA-1: ade897f0fc2496dc0844e2c15b2aa864ed7345e4 SHA-256: b91f78e4388f6de4c0ba1718ddef0fb4d21fb27be9ecd60e4896f64da84536ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage, suggesting an attempt to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780dfb97772---22373636282.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2141855f6---24250941155.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///19659761396.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/729d890b15051875854d715e7eb7198d/xezolujabanakujuwikema.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/zeropoxiruzinosibota.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/b06b5a10794c7f0e146275391e2821c7/69669886096.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/12730284028.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f3fb8d58fb55bfc2b3d11177ce2edc0c/44027926367.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b29d1ca810---63791711393.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8121322ed---rakikis.pdfIn PDF document text
    • https://reniuved.it/file/20554113598.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bpk4i5bb17k5ol4nuo9lbnasv4/76049401968.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zalusutawimoruz.pdfIn PDF document text
    • https://menu2uplus.com/images/file/mufejanitakasokawowutigoj.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f9fc78a4---92977084255.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/d8ld5psh6iv8m49if6alcopd72/marazajuranunotononuxonaf.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/10483819759.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/buraxejarexixuguvezajepo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc1fd3a35f---84844618029.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c4330a533---keteberazamegenukefatam.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/p6d08gf01hsdufmbo75241vqnr/tenopajoso.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c061b9bc8379b3973ecfda170b4e4e85/32529076798.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16112ad0ac7833---tuwononuxunexisatokadagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=rastafarian+language+translated+to+english+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_off0000bbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAD 10924 bytes
SHA-256: e788a52e06b29fa81be6b102dbc882057702c617dbe8ac8a641b28553fbe86b9
font_01_sfnt_off0000d4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 16512 bytes
SHA-256: 2d5359f116a26f485999578dee796290db9c6964c8a4501fcdbc458735c84200
font_02_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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