Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ad92633920c21a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 23:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67af767a09dd5c6163c605ce9902d05b SHA-1: aaccf645c87807615fca2a5ad0aa7c156f30a883 SHA-256: 75ad92633920c21a8f00b5361fe13df7d6bc1a1ce6f07416b1a65b85d235775a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://hsound.ro/images/custom/file/lujulaxobu.pdf
    • http://gruppocaminiti.it/userfiles/files/82027570502.pdf
    • http://ibarugi.com/fckeditor/userfiles/file/nenaw.pdf
    • https://groupburuemas1.com/contents/files/sinekumigabimakewoj.pdf
    • https://iva-vietnam.com/userfiles/file/jotagese.pdf
    • http://sportingfoundation.com/uploads/file/47156526807.pdf
    • http://gestioniarmatoriali.it/mamuregatete.pdf
    • http://phupmirpol.pl/userfiles/file/rufuxuxaripusoxafopaw.pdf
    • https://suativisamsungtaihanoi.net/upload/files/60661610790.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/goxepotivorexusisun.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/7741b5d332a53987074f1db0e28b4b9a/20576813059.pdf
    • https://satesayap.com/contents/files/nanovedew.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/pixomegekoposokasi.pdf
    • https://alkoplast.rs/files/sejuvagavit.pdf
    • http://asja-doll.ru/userfiles/file/wijidowu.pdf
    • http://suriyedostlukdernegi.org/image/files/zilaxifalojibusud.pdf
    • http://excitechem.com/userfiles/file/61350218249.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/v4rbe8idglahll2cmmj8t5eqb0/27306045622.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161378d14f2afc---loloxajukesudopemelove.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148589998c37---nifunizotilavuxed.pdf
    • http://www.farmaciapenil.es/userfiles/files/96406156575.pdf
    • http://lso-msm.fr/userfiles/file/3371039535.pdf
    • http://bodybybodyology.com/ckfinder/userfiles/files/93417050589.pdf
    • http://siripanyalamphun.com/user_img/files/nokexamavitogulo.pdf
    • http://kaies.cn/upfiles/file/57301464072.pdf
    • https://denimder.org/resimler/files/83198782205.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=websites+to+watch+the+legend+of+korra
    • 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_off0000b3ae.bin
53d8f3d55824aa98a9fc6e6e165f0bb70b00807530c7131534597c763ac92b8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AE 14672 bytes
font_01_sfnt_off0000d8b0.bin
598769b646f0fc623d21aa3129bca21f516193703d357244b0452e4d3422ef8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 11068 bytes
font_02_sfnt_off0000f247.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 16792 bytes