Malicious PDF — malware analysis report

Static analysis result for SHA-256 67987a0d72b04ea0…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 18:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fa9ac73e19c603304482f4a50abbcf96 SHA-1: 05ca2b02176d1dd410323bd6ba7897b7c1bbc236 SHA-256: 67987a0d72b04ea0340a3312762600c1e5ccc919f0bf094c857cf66d94c51040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nicklason.se/ckfinder/userfiles/files/70655594281.pdf In PDF document text
    • https://777mto.net/contents/files/bikobisatuvi.pdfIn PDF document text
    • http://losangeles.songhakbbq.com/uploads/files/97976910176.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/vugexigerew.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/52433077658.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/totuguwevafofunutux.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/6829652839.pdfIn PDF document text
    • http://origo.ws/userfiles/file/85099131889.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae855ddb19---zerapazazujesebisutenina.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/64678160644.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/49880740062.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/mabafazapalaliwoluxola.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/203952ad3a31ffcdb0e2e15e5637c6be/36986433853.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/21774548216.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/jegifatezux.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e71bd57b52---nigunumamisikapotaz.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/gipidodelet.pdfIn PDF document text
    • http://househouse.it/userfiles/files/zufok.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/13581854261.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f64a08f2aed02d6ac7ec2f9f013255f9/41822988259.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/laragoweliwodewa.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/nigisexijexinusul.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/70481374236.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141edd927e6e---vilub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=difference+between+cyclothymia+and+dysthymiaPDF 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_off0000b2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DF 11084 bytes
SHA-256: 5d81468ff1121b4ed98ce5207dc9044e8e37e984e2c6511a08d27a530bc1a01a
font_01_sfnt_off0000cc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 14632 bytes
SHA-256: 3145edd27aef8433a5674fb02601d9e13b4eaaa30e89bb990191fe81c838ab83

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