Malicious PDF — malware analysis report

Static analysis result for SHA-256 b271b32aca1248fb…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 02:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81ee2fa9964c84064c8c1a0a10664351 SHA-1: 67846724ff0789a1e7d77b8ecb4aa08f700b7949 SHA-256: b271b32aca1248fb2b8d3c25f575337e0b069a0afc257de3f14ba7f5f20dce2d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the overall structure and URL analysis strongly suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68b2699d2b---tunorijasokisifagudim.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ecf08f4d---pizafadejanexup.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/99481675194.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/94013577761.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/megemazatalujizuse.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/39480535151.pdfIn PDF document text
    • http://www.pilartangguh.com/file/65305195548.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/mieor6n8b0aq8p7qi1862l03t0/tuluzozetekaponejuka.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/jirev.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/59694242256.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecdb10be84---69467843193.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/vorezedifazisewabaral.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lplib171vd9jimduv2pbqsorlg/22906773107.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f96qhn3gij524vu83b9uu0ks3/7428288839.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/zupew.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/morunag.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/vajogemalikaribisa.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/baxakorerosimaf.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/947836d04636296dee322006626d2b2e/zifexazazajaratex.pdfIn PDF document text
    • https://x-software.cz/data/file/73552071630.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/wolukuxelanusogurenize.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071925e83581---65721599120.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851b526b815---99664430374.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a904f2e46e0---61628345145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=resumen+del+libro+edipo+rey+pdfPDF 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_off0000ce7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 10796 bytes
SHA-256: 736d62bfd502eefba897167df181b9651382dc7464c1c5e2d0a321169b3d087f
font_01_sfnt_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 18108 bytes
SHA-256: e2a6a6b87ef0b89bb39fd6ced490e5c4d90d6af637ff5c405213b09e45e0b931
font_02_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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