Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f94b305132dddb3…

MALICIOUS

PDF

82.0 KB Created: 2021-08-25 16:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5fe6b652c37bf0b8c325953267b6fae9 SHA-1: b4370087da433ede29652475c3029be613cea698 SHA-256: 5f94b305132dddb333ee633d4f1ad80b3a14ee21bbf4ea1c08ab7dc6d57e2268
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL findings point towards a common technique of using documents to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=malone+fit+guide PDF link annotation
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ba90241e---zafulanaxebilesonexikasow.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607100426f9cc---88390780046.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/cbb714f206ad47c6894a7efa9c65d7c4/45390877992.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/xoxigerajuwupodadopulo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b430fab2e8---21371037827.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/91123194728.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e515fc318a2c3e8e117069a0a9fdac67/80299835135.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/97284101101.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/tevowumejabomarular.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fv8fu9a39fonglde0oe9fskke3/faxoxosujitopixifodogex.pdfIn PDF document text
    • https://777mto.com/contents//files/puzapadadisamagolabanane.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/91555301559.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090add1c8d24---60330992340.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/29422650159.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/minewafu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c16e1308db03f677f57244caa1a9a66d/68742626045.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/xemelotelupidadawalef.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/58fp4socek8smvm87vgj1k4ft8/nekijunedijuzigogejadegi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4324611b37---rasasoripepikokitezu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083f157c135a---dabajefugagovezew.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe5c1ecc85---fufoje.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eb5ebc0qc301m5chc07fsjb4q3/28410195493.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/jasubikobetotogemi.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/baa369e2d94934858b437715f9840f5a/savimimin.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_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 17312 bytes
SHA-256: 2a5c2dd2c89152077a182abd49205246a8ec1ce9acc3b234f7460ab80b728da1
font_01_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 10356 bytes
SHA-256: b933f0c9cf1ef67d23a5e29ec28611d412a6b93762b1501fe0ebee71b47ade35

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