Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbc2843b58904ab…

MALICIOUS

PDF

75.4 KB Created: 2021-08-05 10:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75a50647825a1a0d557a8e852624d640 SHA-1: 635a3cfc3bc25b61aabdbf4e6fe5aa695e256ef0 SHA-256: 5cbc2843b58904ab3b911fd9a1abcacc547c7672f598c65585a2e36afb0745f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/2d73cad2d02e164d58da373815ffaada/fukozapipefulir.pdf
    • https://erdenetpost.mn/userfiles/files/biworu.pdf
    • http://champagne-marc-chauvet.com/images/files/63662257226.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jn7jjo0rjg2hutqdl3cg7q166p/52621388840.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160857505b01f9---sirewelu.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b802ca1962f---merazowopevi.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b597d378e1---74375192965.pdf
    • http://eyupsifalibitkiler.com/resimler/files/93196646584.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081571207a72---15126053054.pdf
    • http://biurod9.pl/public/userfiles/file/pegamedigami.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/75065ea4158497eaceeedf2a1032b459/14996424240.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9634e8736---rubexotifelojubesirej.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/mg02if3mvipp1fvlbo2k8hguco/8821851352.pdf
    • http://congluc.com/upload/files/13823081339.pdf
    • http://ippon.lv/uploads/File/52696308274.pdf
    • http://wolfroccatiassociati.it/userfiles/files/93761625099.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/h369j2jli93a2qkf6jrkm06b06/venami.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88b9670b46---zajigow.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a134eb121---49311967992.pdf
    • http://broadgatecapital.com/userfiles/file/23857217324.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72dc6420c---96065077488.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/649a6e0992807de8b71dafb0f7f330bc/muralufovakewutu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=kala+patthar+full+movie+online
    • 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_off0000c29e.bin
d056271bb7add82936ccc3299ed359b950aea2e0e19b2ac50eda9014e9e7b682
pdf-font-stream PDF embedded font (sfnt) at offset 0xC29E 10612 bytes
font_01_sfnt_off0000dab0.bin
ce0af5fb772ad5214bce73034c8161e5f615032f1ef23fe48a81788d2726b70b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 16280 bytes
font_02_sfnt_off00010544.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 16792 bytes