Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4b564b960b7c07…

MALICIOUS

PDF

90.4 KB Created: 2021-09-01 05:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: acce1229a8c3eac5b9f08f7b8d48d7e8 SHA-1: 0105b80fb84530e26fb65d9214f1f8d05c9ae74a SHA-256: 1d4b564b960b7c077bb9b710c3ce35d690ae2f92212797e7d0028e5ef85dd35e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://casalindasbakery.com/ckfinder/userfiles/files/sesexowanotosemukoragi.pdf In PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/516c2df402e465e9def086ab7d8edc69/resolufe.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b9ae32553---taxajeze.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/1p2m205uc5l0jifrsiv9lka89t/papasuwurovulowafupefux.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/32d200d61e05a259b5d2f021c7be8ef5/selus.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/60800221121.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2c23164d294c1a6f0d23d955ef33819a/jevuxuvedalisi.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/81698308926.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/fm4adkcesmabeeld21v05ph0l0/wezok.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7cf29d1d184d6f256a38647b940290d7/63131060071.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108fbe51bc98---temasodo.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/femunurifunoxisejibalo.pdfIn PDF document text
    • http://kechengchem.com/upload/files/91092369773.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160887e3b0a55a---xavawevudafigilotaxawoxuj.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sdups10vhdh06a9k3h730kt090/40142934434.pdfIn PDF document text
    • https://somogyplusz.hu/files/kefuxoribapazomedapurer.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/bodufakoxuxebusumodo.pdfIn PDF document text
    • https://vientangluc.com/upload/files/86415970498.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/93409545806.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/pagugajepikago.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0afc610586---babakivubisozinekonu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c98f6723c---92363646323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sulfur+protons+neutrons+electronsPDF 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_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 19248 bytes
SHA-256: 1a7795109a91178116e104e76807686b847cf24f1cdc75430611cb52cb493f7a
font_01_sfnt_off00012cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD6 10396 bytes
SHA-256: 8585346ba8e57a03d1964bd6157ca16e08ebea4d8568a97e169eaf0adaa05ea5
font_02_sfnt_off00014484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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