Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb236515fe99b9ed…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 13:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bee244c5069d1bd0225db8b96b34fe4 SHA-1: 3296a6ac9222f8c799240f67fd4ede7ee9f2f4c1 SHA-256: fb236515fe99b9edb4f957a05b049cf83cb2307e972d8419171945d5ed685c99
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The primary attack pattern involves redirecting users through these links to a malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://gerd-pollak.de/userfiles/file/jorajuzaz.pdf In PDF document text
    • http://www.first-classlogistics.com/image/upload/File/85313084988.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8c974734a8d9656023b11810050ad578/jusimelulalanu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qlbra5icdf9s2lk5tasffavk0q/53894974989.pdfIn PDF document text
    • https://magerp.org/upload/files/792557313.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160948be9b199c---sifedaxojunoba.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/gupikanogisaji.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/fc8b889c50605c95cb28c6e97abf6006/nowemutadavegi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d5e8d10c4eac6f0a79ab8555f9a9f28e/taxolirupe.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/noxuregifopotegetik.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cd880f02b21---19208269409.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078bec3110b9---34920057660.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ub5ok9lhvsdr9or7a0nos82v0o/8827201525.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108102123113113.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/63090331001.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/65469634557.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/23902944016.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/62983137928.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/25ac62b64253f2a6d5781a19c5f89734/20910058981.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a479ec9f---96741814098.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/perexixumojoxaf.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/5e64e501f840c94873714a89d31b7ab5/98551638991.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9687c1b24158fa8b600665cbf644f1ab/48962801007.pdfIn PDF document text
    • http://m2m2design.com/userfiles/59808238431.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1975e8d97257465540486bdfc1a75d52/tojisikazasefexuvoguluj.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/tevopake.pdfIn PDF document text
    • http://sjhtractor.com/d/files/bemujopumuded.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=standing+balance+exercises+pdf+auroraPDF 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_off0000bb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB54 11212 bytes
SHA-256: a8922773b131093cfba6cd86c29a631eafbeadd7c8d30fd07853d9bc9671babb
font_01_sfnt_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 15456 bytes
SHA-256: 6c856d50949bd2c641b4ce967302ba8372f1999b009599df626302cc80264622
font_02_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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