Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c22bdc23a759a6b…

MALICIOUS

PDF

93.2 KB Created: 2021-08-07 08:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a04af4a5f41584ca58e6a125c033d8e SHA-1: 56cc5913333d7157911708516f8f43aef2251a81 SHA-256: 5c22bdc23a759a6b2e8360aea20e8354b241e90134a10d527cd7716c441d01ed
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of exploitation or redirection to malicious content.

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://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/v3ds8efj5cmmihk8ko1nac6qcs/figepubelixilupaxu.pdf In PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/wanugedudabebixizaf.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/b5b8c46e65a45a0f90d1d5458dd7e5bc/65049267142.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65a4668216---duwerofuvifame.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/hgg94n58gsg465b7q164jp44m2/9871101271.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4a1b1b22c---27788187954.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/0619022012.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507053204355329.pdfIn PDF document text
    • https://maturana.cl/upload/file/larixodiva.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ccadbb360d8---65838231926.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/8bcd3fbb4efb39075a8922b7cd846758/6431463516.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bbcf9c6c538635971fd6b8e5b67715c2/xerovukumirukofovezu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf5173509---fagamuxar.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/jajinoduwinis.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086fbee8dd2c---jozudupegujesizemonumaze.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee0b2e4eb---17534730577.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/palagesi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b03e5565---92835768915.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/26731037839.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/9706643886.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1e5e728f13300cb1169696cf47d920b8/1597806027.pdfIn PDF document text
    • http://ttc-investco.com/img/files/nezuvivupodapamora.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089848f89405---38064278552.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ab52d7fee2364476e8cad84e2e4dcb6b/76856134375.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/71717078346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+money+gta+5+online+ps4PDF 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_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 19448 bytes
SHA-256: b1ec3f736db52f5b2b98d2c3d2ee686573ad2e7df3a8d0a7e163a84ab9bae4c4
font_01_sfnt_off00013321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13321 10988 bytes
SHA-256: 7462a386f5684b6f98d576fc0e6d5f1ab3eefccf98aeaceb48d2f2c687520ccd
font_02_sfnt_off00014cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1