Malicious PDF — malware analysis report

Static analysis result for SHA-256 55956f07c086949b…

MALICIOUS

PDF

89.6 KB Created: 2021-08-10 07:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5783759baec3d5bfa6abfa52b904279b SHA-1: 6e17607aedc3b625c1912e2ed9d29d0ed904fc25 SHA-256: 55956f07c086949bc72a383d6bb9847a25c11801d50b0272b323e6479ac35797
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. This suggests the document is designed to lure users to malicious or compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://conexkarvan.com/cache/fck_files/file/zuxokidiparej.pdf
    • http://megat.pl/uploaded/fck_files/file/31926524194.pdf
    • http://keralabiblesociety.com/fck_uploads/file/30215437117.pdf
    • http://haworthclassof73.com/clients/73472/File/pumemelivurobegixex.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/f240ac733d2cc297861d866cca27c30a/nekivisugexataxutavuzexe.pdf
    • http://khachsansapa.vn/webroot/img/files/43102390877.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1277514cf---30263742346.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609119c4baf14---xufegalovejadojavo.pdf
    • https://dalilak1.com/userfiles/file/wozupupokedatosabubixen.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833f82ab73b---64039765722.pdf
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/wuwofepimu.pdf
    • http://kapli74.ru/upload_picture/1755593159.pdf
    • https://sentinels.ro/userfiles/file/givenovolakikipadurufexu.pdf
    • http://teifsepahan.com/files/file/semujunigagajobogu.pdf
    • http://longvu.vn/Images_upload/files/bonojurubufonamoke.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad18287066---vapapadi.pdf
    • http://rund.cz/UserFiles/File/fipenimo.pdf
    • http://suchanekstomatolog.pl/files/file/75281662003.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/mum48h0vhnc0ire6r89i9j26ev/90823305058.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5135d81515---wovanaterafuni.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7db31b951b5d0270b285beb2598251c1/kadetebisawitojagebow.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/63810790548.pdf
    • https://anmoul.com/userfiles/file/32397246284.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/00dc87aba60b7fd7c0ae05c5d11945cc/butesuremibusonakumonibor.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/befurosizizexisafituvine.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+connect+onn+mini+bluetooth+speaker
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f997.bin
3ae6b7129b6c79bd85fc6f45e160ab6a60930517029b8e6e033e2e6aa3959c38
pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 11048 bytes
font_01_sfnt_off000112e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 16792 bytes
font_02_sfnt_off00012afa.bin
e635466e8ec92935aabb5e01f036ab7656c9b589f1b12cf51d9e0de3feae70c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 17316 bytes