Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f53591bca56442d…

MALICIOUS

PDF

93.4 KB Created: 2021-06-26 01:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11b447bc5cb023c829bd2edfe831f41e SHA-1: 228c57d0d4aeff0e4af1d57a13a5a593831d3f08 SHA-256: 9f53591bca56442d81814162830ac6c3c51abb8c65df9d753a3a2a412ba6ce10
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://dzbnf.com/upload/file///sadupibepalerefabur.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kt0k7jhgj6rfv4k40rjkp4jks5/miwasuwajemizigotalazolo.pdf
    • http://bhs-class1957.com/clients/35434/File/2117529744.pdf
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/milukopuvopudo.pdf
    • https://protradingindia.net/userfiles/file/72059502928.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/fcd6ca0f67cfd92dd60b3d431d3d6c4a/84289901450.pdf
    • http://stalmont.eu/userfiles/file/18478747661.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/90f6af2766a4e915f92eea7addb6bf09/vovar.pdf
    • http://lightningriskassessment.com/ci/userfiles/files/23076316687.pdf
    • http://creptiles.dk/userfiles/file/pabixa.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d21957fb3d817657c81933d9fac4a3e2/rotefuvamasezopunide.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/bedemaxubipijikosofe.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c39cea5c491---9487973343.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160893c0e797bf---zugikozob.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe4c550e6e---botaj.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3602e89fc363e1b302b2270eac9eb26b/23862185565.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608177ef0bab9---vanijaxerebudina.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e51d96d1fb5d35c08910e71c3fe323c1/47970264284.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e77c4c4a---35734581067.pdf
    • https://amadesafar.ir/basefile/amadesafarir/files/5799352716.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a060c186b2f---25118664717.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=heat+of+formation+calculation+formula
    • 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_off00010841.bin
c734bdaf752ddeaa80ce54c33019758272ceca437c801a6efca6a29332ef7c7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 10420 bytes
font_01_sfnt_off00011fc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 16792 bytes
font_02_sfnt_off000137db.bin
141f7e3200652e072257d7dfb2b920c4a989c46b68364ff60ebe9f09ff45b88b
pdf-font-stream PDF embedded font (sfnt) at offset 0x137DB 17832 bytes