Malicious PDF — malware analysis report

Static analysis result for SHA-256 d825b7827a738353…

MALICIOUS

PDF

85.9 KB Created: 2021-07-09 19:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b5d2b3de6bb5dccf171a0cd234b526e SHA-1: 2f08500a1f401661cd5212d1bad0909a91f323c1 SHA-256: d825b7827a7383537af70e57150fc6434870eea5e79d0bb15bda200b80943440
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the presence of multiple external links suggests the primary goal is to redirect the user to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://churchboys.org/userfiles/files/27912079491.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb0e0058d---25051196934.pdf
    • http://a-mega.ua/images/uploads/file/selafamivaxejosotekikamif.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/04911859e0786ab79285cd2e8f950ab3/subiborotumaserowuzesuto.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e3cd5bd00---46155163055.pdf
    • http://amsasecretariat.fr/userfiles/file/28371028555.pdf
    • http://peusch.lu/userfiles/files/volar.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/h1kml3cvbs9omgnr0r8lv7l457/piranunovebite.pdf
    • http://antifftech.com/uploadfile/file///2021050208210225.pdf
    • http://sdds.be/userfiles/file/zekedapenusokebowagi.pdf
    • http://dezmaster.com/userfiles/file/sapedafexegegafovujizunew.pdf
    • http://cukorbetegshop.hu/files/busibulasu.pdf
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/tirimobigejenurabugo.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee80f94e98---kegagemodozimumixa.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qp9uoc5e1abagrv4361ml2tco4/82072544127.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf03710bb3---vububusagosotilud.pdf
    • http://arci-mp.fr/admin/File/18772887520.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc14ae033---zurezeduluje.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0c88d37720775d0ed625589e22c24556/derepegizudep.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b25cae74---91241947461.pdf
    • http://painttechvina.com/webroot/img/files/25096718786.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/350c01be3141b8fdfe2734483af8cfe2/galenetevupuxevep.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/5m0i73a5g4706q1bletfj6097j/29159101748.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d842bb5be---84038593506.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd68980b0e---35943126315.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=upper+body+exercises+to+lose+belly+fat
    • 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_off0000eca2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 16792 bytes
font_01_sfnt_off000104b9.bin
ac2c92fe664cbb6f4989691d6d34fa3d5f3cfbc1a4c25d038084723e3dfff5db
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 10872 bytes
font_02_sfnt_off00011dc7.bin
13d00b40b6db4750a942ded08cd4f493dd036bc359ff1d73fc92fa16cacb892d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 16912 bytes