Malicious PDF — malware analysis report

Static analysis result for SHA-256 235dc21fcafc01e2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 21:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2f367801c146bde7af200964cf23069 SHA-1: 928fc229b14824148304c663e9013da5d68de3cf SHA-256: 235dc21fcafc01e2a804ee7339f51b09caecddb71ce46f547106eb2bb649b336
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.bmo-agencement.fr/ckfinder/userfiles/files/katabisoleworagivol.pdf In PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/tiparitojolad.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/penunifumawezit.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/41772224027.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/72654834773.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/kupejoxara.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/muviwa.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/79610833149.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/topigu.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/69756225750.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/pozisuxagodolojiwok.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea555329f5---fivopupikipifizapojopa.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/91923489365.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b65ad9a6---5846835600.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/lulexekigosetojilatop.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a6741b32---85406944251.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/kupadusodeselakarepopa.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/segiko.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/tegupetunetoj.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/fuxutixu.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/povutuxeroxo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a0f5c5ba41752017b2fb330bf9a75abf/39609035235.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/tavipitexobewafife.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/lanalawagoxupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=facebook+auto+followers+mod+apk+downloadPDF 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_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 11084 bytes
SHA-256: 2b5a32293cb16cda6c150b5f6d5cc35a40641b81e0e38d4ee5dfa3eaa49071d0
font_01_sfnt_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 18900 bytes
SHA-256: a332ab579187f2bcb3ae27e415c05e60383f3633e15fa4fc584a3eacb0316588

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