Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea184e9e6354881…

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 15:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64d5a234518fb4481a841756ff1379d5 SHA-1: 15f01e5f20fb7b087c483994d001ff3491fe0fb3 SHA-256: fea184e9e6354881f15ccc8bb5880ae704aea2eafae4a16e1ff50ace1b4ddca8
146 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it contains a callback phishing lure, prompting users to call a phone number. Numerous URLs are embedded, many pointing to compromised WordPress sites, suggesting a distribution network for malicious content. The document's structure and embedded objects are consistent with exploitation of PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=from+syrian+lira+to+usd
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5f47d9ce9fee30628ba6a705b972ccbf/jafubupufisovimov.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/oqi2vhc0sji7o4m55i5cdcppfd/xupute.pdf
    • http://vieclamketoan365.com/upload/files/xagawisiparabukepujigifeg.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/a4gh8a9v5m6o9uli0gd6mhqkog/52028729008.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ce6ace2544853511ddba836dee8d614/57976660584.pdf
    • http://614move.com/clients/4890/File/73474985599.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/a26ff6125e619690fbb66213e9fbd0bf/nitivugonibudemuvubofim.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a783d9fd1f---42831205301.pdf
    • http://suachuaspa.com/upload/images-content/files/50332336255.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d035907894---21579510309.pdf
    • http://sugarfree-gelato.com/upload/file/sinoforeme.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710a91bffa7---33558394470.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160773ea62e45c---53358303968.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094c72453fd9---xudusadekapudakinasamupok.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7jmmc92i6bbq2hm6kn3jqnbl76/29406609166.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3ecbbd111681fc9ad6f86b87a07a2196/53896095.pdf
    • https://eastmanllc.com/ckfinder/userfiles/files/nokurimufut.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba62c76f2c6---35282709693.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210608_D8B6D40DF88E616D.pdf
    • https://nanyangtextile.com/userfiles/file/96783985043.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65eac3cf1d---dasaji.pdf
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/35444564662.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd7f59b5b---fiduw.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67b20807e---54467111215.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/72a4068f9063da3d552f61208ca2c47f/fisupukukowineneriboxu.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d905d21e9a---gemadusawimixedixekek.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1d.bin
19a96d6ca28eb604ffcb839b53d79a179760596a438e8f6eb172cf573cf80257		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 16804 bytes
font_01_sfnt_off00010a2e.bin
702b82ef157aea8b1196fea0274efdfcbfb22f8a57c5fd85b616ec3060d04c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 10468 bytes
font_02_sfnt_off000121ed.bin
38adf945e669dd2d97c941131f5818fc1992319d00c2be3078d2615b483e4e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 16332 bytes
font_03_sfnt_off00013849.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13849 16792 bytes

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