Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51554449b642c74…

MALICIOUS

PDF

91.7 KB Created: 2021-06-30 20:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72652283eaa3bbb184c3565d6c79e52c SHA-1: 6305f1afcefc3338a13342e475cf9bb96fe82fbb SHA-256: d51554449b642c749b7bfe17888c4b05b2680259e6dfb432e835db40824ae314
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various compromised WordPress sites, likely intended to lure users into clicking malicious links. Although no executable scripts were extracted, the presence of numerous external links and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742d5a7ab6---xenokaxepazevogosub.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a456787da70---22654133874.pdf
    • https://atpl.aero/ckfinder/userfiles/files/51637964797.pdf
    • http://musikpark-live.de/userfiles/file/80462516071.pdf
    • http://zulassung4you.de/bilder/file/kebip.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca7b65038e---bukezugepulogani.pdf
    • http://ever-pioneer.com/upload/files/63807933353.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/59532538693.pdf
    • http://pileshoppen.dk/userfiles/file/73619545863.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2lerh07jvkqqh8q56jm4elkb17/73121591474.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ecc2cc0a8d5405c685736d883a066c89/metas.pdf
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/77598159401.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/66e950fcba9f768c83fd2082f58943ae/74268024918.pdf
    • http://rheinmotel.com/userfiles/file/91128909316.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/22c014310c26c3ff4960451e0f54f6d6/lidewavaloduk.pdf
    • http://asupuro.com/user_data/image//file/kudagudelid.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/e2b5184d8b0aaddb5c684fdde7fd0113/63272445686.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/5959285570.pdf
    • https://paron-rebondir.com/uploads/files/53159219573.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6a452bd3921fa7dec0127007fcd48a70/ratelew.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/xuxetibozanejopazujep.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095e19066c8f---wononedaber.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/4naq7ofuc6e5moetpbql05dgf3/dopan.pdf
    • http://artpolyclinic.com/file/files/fixozefapefug.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/275480fec03530477ee917bfbc534cc1/mixirupusujadi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fortnite+save+the+world+collection+book
    • 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_off000104f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 16792 bytes
font_01_sfnt_off00011d07.bin
fc5ce8f2441b31756904b4e773dcbbd9ce9666120e2c5b3d9507d6ad1bca046a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 10828 bytes
font_02_sfnt_off000135f8.bin
32760edbbc8837166ab7fc151aeb45dc03c1dcf34838decd70edb09f987c5e38
pdf-font-stream PDF embedded font (sfnt) at offset 0x135F8 16780 bytes