Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a1338f5a9aa260…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 05:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fef7fe560c37f4c0ce45c2571e3866e0 SHA-1: b9394c31427c15e8bc8773d3bb7855de23632bb6 SHA-256: 73a1338f5a9aa2601bd7a164e8cb9cb8d7e9e098879351899c043b780547bea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cakenepal.com/userfiles/file/dowaminubilaki.pdf In PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/12183927144.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/ponezopugujaragorirajis.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/175835a7d9eee4514c41f378fb7e24bc/66752288315.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/86654138275.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19280692df---fopefajironope.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/80884003406.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/s7lvtdlbdr70t9ehho4cjhpom5/12897428627.pdfIn PDF document text
    • http://geraldkleinlaw.com/ckfinder/userfiles/files/jopiwowewagukub.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/xuwirubajebar.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0ef87442c08d7880247e4b00c57d6ed0/pajewebu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16116184daeb5a---13378921106.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/rurubozupakobogej.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/94332735753.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e645d1a78c---33494798630.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1ecea994---zosovexozeda.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/83023431258.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51612c4a4---50291626687.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d081a6bc4d8---64510449511.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/pawuwugiduvaxiwigobef.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/vevijekumit.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/fozixifopokexubimixep.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777e9a50cfc---47933606093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=speakout+advanced+student%27s+book+2nd+edition+pdfPDF 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_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 19564 bytes
SHA-256: 189f88eb01c978c8e2957121a0fab7abf224195d689ef678c381297d5d37fd73
font_01_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 11096 bytes
SHA-256: 5b902763b82feca4ac3a23d67d693906865816e24d054784e8656f4522d15efa
font_02_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1