Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b4d3d2403e010f…

MALICIOUS

PDF

83.8 KB Created: 2021-06-26 16:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89e3c3522e086813766588e9e70fc12e SHA-1: ba5a04b5ab081ab6e6a550135d7f3940b903b086 SHA-256: 77b4d3d2403e010f1d6392a4b6453f9cdbd1b36233ee7c3c48eceb7074088272
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits a high-confidence malicious classification, primarily due to its 'Payment redirection / bank-detail change lure' heuristic firing. The document contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for financial information. The presence of these links and the lure pattern strongly indicate a phishing or financial fraud attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=200+dollars+to+rubles
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c02a9ff30---24676221932.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c007e5298522aab305108a53d9f4dfd1/vopusiwevelita.pdf
    • http://arch-teh.com/pic/userfile/9942143576.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/juzogosinufif.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/18cfe65af36de6e1362f7754bfa07e2d/damutegof.pdf
    • http://nw-line.ru/generic/uploaded/kamisexojuj.pdf
    • http://smflow.in/admin/uploads/file/74694502198.pdf
    • http://netinflux.net/userfiles/file/36478591904.pdf
    • http://szyuangang.com/UserFiles/file///zuwokudepuzuki.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6241de8169---30186579481.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33dc494736---67056885340.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/61e4f4a66c36dd95e958108893474a3f/wipenilifabozevokov.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/kaxanoviropotibenakala.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608494bf6a88f---56476219759.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/aa5e52fcbd30848daa2a384bf58139b7/13088694162.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088dcf436fec---62723900198.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/76894463177.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e44299f9---77942816364.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/jqrrbg1rk04or5uhof3dv3b286/rikipim.pdf
    • http://budka39.ru/files/835356318.pdf
    • https://agencement-menuiserie-var.fr/stockages/files/kujibamiwu.pdf
    • https://zemiigori.com/uploads/file/tojadiwud.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0b8bd2f48e8325399ebd76c00ed017ab/togorefemexofedebutexube.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_off0000e66d.bin
63a3019681a3c61443676ea76857846cf89ff57df9fc9c7ed308f9ba53935328
pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 16752 bytes
font_01_sfnt_off00011233.bin
6cf5d9f80b5f9a4381e44d861cad935e14de919620e4f287690a18b1a0813372
pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 10432 bytes
font_02_sfnt_off00012a09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A09 16792 bytes