Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83ae10b81c972ba…

MALICIOUS

PDF

71.1 KB Created: 2021-09-06 16:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb038a73d02b2175c9bf7a614b61b808 SHA-1: 0f06427b1a215058b1a698fe5e6360d4a8d2e380 SHA-256: c83ae10b81c972ba1fdb257533b01ed81012eb5216de8e790387eb1433b0b906
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous disposable domains and compromised WordPress sites, a common tactic for hosting phishing or malware distribution pages. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is designed to trick users into believing there are new or changed payment instructions, a typical lure for business email compromise (BEC) attacks. No scripts were extracted from this sample, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://archism.ru/uplcv?utm_term=velocitek+prostart+manual
    • http://studiogalata.it/userfiles/files/tokivuxesivufux.pdf
    • http://salkim.com/userfiles/file/12860443087.pdf
    • https://hagabb.ro/ckfinder/userfiles/files/39432457114.pdf
    • http://ondrejkocar.cz/img/file/63213355734.pdf
    • http://fanti-fitness.pl/uploads/assets/file/15656664546.pdf
    • http://clubselectionvoyages.com/images/file/vufiwizupizag.pdf
    • http://bsinteriordesigner.com/userfiles/files/62614255590.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c0603c0395bc1b512842846a8046e6e2/digipipimotisog.pdf
    • https://drlanda.hu/user/file/mawivasekul.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d2106a64b5e036f25ccc474d47175572/nilinogimido.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/50576211249.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/pifewonewekarilegis.pdf
    • https://allcreaturesinc.com/files/files/85612804290.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16087584629808---visigulareg.pdf
    • https://dlt-nkp.com/fileupload//file/12671515833.pdf
    • http://www.allatpatikapecs.hu/images/file/280568172.pdf
    • https://eitmedu.in/ckfinder/userfiles/files/23669174411.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jurune.pdf
    • https://hojoairport.com/images/file/fuzazawetemaxivutefo.pdf
    • http://energy-labels.nl/userfiles/file/32975714823.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161235687c6fa5---xapuwokodeginubejarad.pdf
    • 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_off0000b606.bin
09bd17a867e3705c4ec7ccfe260ca7eec5c8964a0a5477fbe1af67284d56b1e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB606 10696 bytes
font_01_sfnt_off0000ce91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE91 16792 bytes
font_02_sfnt_off0000e6a3.bin
dda0c00f0ce9feaae5e3e3b05fc824fe26d7cb675230831279bd9b1f91a590e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 15852 bytes

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