Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f7e0cf01d1dc52…

MALICIOUS

PDF

110.3 KB Created: 2021-07-27 09:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a5877b09b98b54ec7fc2a0e80f2b567 SHA-1: 67d225946654ca857e125b108ca9ab29a2d79905 SHA-256: 04f7e0cf01d1dc5264ab7d1e09ff685db6213eafaf8dd4ce4783925ea4fe4ef0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://areicon.com/images/file/ketuturapivif.pdf In PDF document text
    • http://immobilieninvestors.de/userfiles/file/29719437971.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/vazarodugova.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/54252bae998b5c0c57c889f597b1f7d9/vitedopetenifukeb.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/guwivopunaxotesubivevu.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/kowasukelosedanex.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/18619907595.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/90712641148.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/jopimuvafujiwine.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/932b09019f38fb78427e5439dcee9f21/rovebix.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/69468525478.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/tunatibazala.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/78886769215.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b73f24a84e---rolijagegirepiwav.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ra7a90ofi9j5hc806cqnt96944/bizavem.pdfIn PDF document text
    • https://actor-conseil.com/files/file/wudajider.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/xuwepakudubuxadesavud.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a02caf06725---biritotawimogilavu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aa063f830---milafix.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075457d0eded---71367627485.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65214ddb16---20473056133.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/2849501739.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce985c80990---jofusefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=why+is+wireless+charger+blinking+redPDF 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_off00014b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B49 17844 bytes
SHA-256: a58565eb0410a31db6d4935e4bbd3081c2071afc056fd271f43300d1a7ad8a0a
font_01_sfnt_off000179ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179CA 10856 bytes
SHA-256: 58771e0989a1f74503751ecc94c66150923c5a7b49f646cd327c0bf6f9a69897
font_02_sfnt_off000192a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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