Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92274f65e46af7b…

MALICIOUS

PDF

142.1 KB Created: 2021-08-02 21:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4999440a70c5ea918262bfe1aca103a9 SHA-1: 0a0ac22c44c3349d9110b72e20804080c4fc70cd SHA-256: e92274f65e46af7bcae8bd3b43d7a3b7d378d6ee47aefa987b9901ea3904edaf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gdc1khhfv1k1nmkr3ua6n6a3gs/91236938438.pdf In PDF document text
    • http://vipnjl.com/userfiles/files/taroresetizurexif.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607126e35aafb---wijobupapuba.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f65a3ce5312---mapuzixujegelok.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/35809339320.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089540182a17---kapixuvosakijubesoji.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/gokagupexisupini.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/2jukidajrs2rml8rue41qm9lr7/mixawopugizijurebasewiraz.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/62774874144.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/85163739898.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/fogesije.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160719f414dc68---56641888765.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3acb72c80---53807327929.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/82961691711.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/12981923408.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/d39f87251bb50f4d593ce8a50259c2d0/52345974509.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea38dd8f47---49307946988.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/mazup.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/zezofamanitop.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160af458bf3523---ruxapalusanamepibi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5be33b8a---dokino.pdfIn PDF document text
    • http://veivel.com/userfiles/file/rixadubijezujiwefufaro.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608320c7a2bcb---9072705171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=exercices+corrig%C3%A9s+atomes+et+ions+4%C3%A8mePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001c76d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C76D 25940 bytes
SHA-256: 51f5e5adfe3b731dafdf8644c2f817052e06239bb7f3f2b4a5c70e3e668f9461
font_00_sfnt_off00019660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19660 19368 bytes
SHA-256: a36325ec02126a7bf65387f61dd766f9526a728cab853fee8285406af814c475
font_02_sfnt_off0001f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F610 11000 bytes
SHA-256: cb3cad974d9386bfc723cfb14aa33616fc5faa82dcc42e23a13863774d9f71e7
font_03_sfnt_off00020f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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