Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e8049519b48d9b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 23:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2aa6c3441ac6f246d5653725d39b7b8a SHA-1: d76fa9773548babfa5f174582da920de71a58d1b SHA-256: 67e8049519b48d9b6a5c9db200a4f263c9896b15e6ab4c3227473e2ea5bcbf69
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The primary attack pattern involves directing users to potentially malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609041514c812---60924035101.pdf In PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbffcdb90a4---fanaxikutubewe.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/tijezibanik.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/xebizugefeguwoxexutawazin.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088c1f80ea3a---41616448232.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd26a735b9---vusodixixivajonoripikekig.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/54164181179.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd209116c0---suwedikunigoxiz.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/95512179967.pdfIn PDF document text
    • http://rinsacars.com/files/others/27459427710.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/41208251058.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be01a281b8---98072216357.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/tifim.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/1636122657.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a69583bf929---24803439576.pdfIn PDF document text
    • http://technocom.pl/editor/file/58420536335.pdfIn PDF document text
    • http://chinalabware.net/d/files/pikolatekubukezororis.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a97f4b00edf05e8da6b01d9a5ff019b2/wowinasemikakapolep.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/72019717668.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6f6b18a4345919ae76e4547119192516/37155938738.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/14c8546d73715329a3572382abfc8026/93986396277.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/52284080145.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/1751024332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=breaking+all+the+rules+reading+answers+mini+ieltsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 10908 bytes
SHA-256: fc7c56c2a33b7d8e948a259a1aae598c6b5ce3746e751a4a2a92477f2bb79870
font_01_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 18264 bytes
SHA-256: b8e998b7ab84ad6fe791690e5f6adcef0e8ee018b81565d9fed3177390f29fa5
font_02_sfnt_off00012a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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