Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f370c25f142d512…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 22:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a6f7db6b9c092d845b141b3d68fd7131 SHA-1: 84bef4f8d8dec7f9d341aa351a5b969a0fe36216 SHA-256: 1f370c25f142d512066c83005183454f36a994907cad73c5de70ef1ca21fdb1e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the link farm structure suggests the PDF's primary purpose is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://cancelaria.pl/galeria/file/wonaxopix.pdf In PDF document text
    • http://constantemails.com/userfiles/file/163190246557089783688.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/67724191124.pdfIn PDF document text
    • http://brukbet.com/user_images/file/zazirajimoluzopi.pdfIn PDF document text
    • http://africareview.in/userfiles/file/86099250140.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/26899121570.pdfIn PDF document text
    • http://ossokahve.com/upload/file/batibuvigadazuweseful.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/dadepesesi.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/perimurajirivotanibuv.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/mubivugeg.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/gudamufexixepozoziwesatot.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210917_194725.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/61720735504.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2cc0ec4d0df920d268632bb856bad8d7/65014550545.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/giwogeveboxizuxo.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/majitefudonidij.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/88262921503.pdfIn PDF document text
    • https://svezadjecu.me/userfiles/file/37967670153.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d70749d7d00a056dbc0a4ea26fa4bd48/21075606426.pdfIn PDF document text
    • http://mega.kz/media/upload/files/kovokunezizi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614818b033b97---muriseruzogevumade.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161565b0f34c85---ziwid.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/debovivojojutimunugixe.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/lujiverarijak.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/24975792267.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/20065510377.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mnva3h3i9hsklr918b656nl7cu/92631700762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=birth+rate+by+age+of+motherPDF 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_off0000b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 10648 bytes
SHA-256: 02ba083bc540a5d82245efe6c1047057a547552796fdd5957edc16a1b622cc84
font_01_sfnt_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 15992 bytes
SHA-256: 11e0bc373b885a129ce52866bd23965704bf102bbf0a372c8c14372bfbc09d5b
font_02_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1