Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3bc12a6a1e11be…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 06:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df5043b155dc0bb3587a50c662c667a9 SHA-1: 489055d13f72cf0b30cb2f5256dbbe49b9b2a8cb SHA-256: 3b3bc12a6a1e11bed007ebfff02fb6341c207ba587838bbb730956cecec03f0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics suggest this is a phishing attempt, and ClamAV detection confirms its malicious nature. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=hptlc+theory+pdf PDF link annotation
    • http://twfbs.com/ckfinder/userfiles/files/17972118665.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609744e46b368---wadunofinebome.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/26338920278.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/rolopixisawidolole.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20217255815584.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16082c45610606---zudejesagisonerig.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/44502653397.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202108261830128597.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/37810212382.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/50898841135.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a627cf258023d0597c8cb91d1ff1e41d/2410833057.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c50d51c4f1f---gojemagewibalojatawedow.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/lovavowijalogi.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608648d3d37b9---59518023094.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/76623830957.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/10b6rniq3kkekatjjctr8km9a5/9873463847.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/gotekosabusakadunuvi.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/34031220384.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/66217471054.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///35148051122.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/lamobokuterogopavafidi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4d0dba8ac33ac27727f150b4ec710ac9/70174133613.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e213218741---zigirepekidifuzuvifepoded.pdfIn PDF document text
    • https://careeraccelerators.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076115fafb39---deguxiz.pdfIn PDF document text
    • 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_off0000d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 10296 bytes
SHA-256: 74845163f8e1a2c8a37c59ab0ef30898efe2179a0297dfde80608497a59c4b83
font_01_sfnt_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 19548 bytes
SHA-256: 237acf842c6caec9da44f18e5ab5ea795055f1254bac1f064e2bfadf2485f0e2
font_02_sfnt_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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