Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d64f55d27ce2264…

MALICIOUS

PDF

165.5 KB Created: 2021-07-31 03:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 28d2e581a61061c0c21020b58ea6e1a9 SHA-1: 314bb63209ddbd874c7f63a8e2012dc3fbe1d41c SHA-256: 7d64f55d27ce2264fe8aac98927bee16739d931780254d46b252fa1635c86bf3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7671

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089272995737---bepijizivatanosos.pdf In PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/jitawudutadefu.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/73517661519.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4148207c9e---86512813673.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/icr03vh7jdfpurq2mjrl00f7ja/nowip.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/53473649877.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/31436700167.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/6531218450.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/fbf4153dcd8fdfc54d1e7da2485d68aa/42870381579.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/bc545db4efce6d9d0576e0a78869fc80/39733241240.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/657194c1dc8414be388a2a92914bf508/nogewezabanedevewozo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078898dbf402---27121713930.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eecfe4307---lozisorogagubix.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/kujerinazokinel.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c254a55d9a2---28129033551.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/98823526950.pdfIn PDF document text
    • https://service-panev.com/userfiles/jojowov.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/4554491375.pdfIn PDF document text
    • http://wenxuezj.com/images/File/470190579.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/vagibojoropibepamulud.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/tesanarotozoxuvawifusata.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c313f387792---sisadibonebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+your+boating+license+in+ontarioPDF link annotation
    • 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_off00023050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00024867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24867 10836 bytes
SHA-256: ecaafdf4edb4642885588b0a1d33cc355e57d55a390295c917794c09dbc83b8a
font_02_sfnt_off00026193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26193 18256 bytes
SHA-256: 875e488ced3017ae9fd7cfb98d2e01151ddca6dece1f12e9f04f9a9da0aacda6

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