Malicious PDF — malware analysis report

Static analysis result for SHA-256 3727b4525ce02c17…

MALICIOUS

PDF

83.9 KB Created: 2021-07-05 00:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab17451e924e95962a934e09139bd899 SHA-1: 4e3689a6ac0601522aaec7377dbb770823aadee8 SHA-256: 3727b4525ce02c170ec8e86f91ee38e4b02959307b7ccc1e62c3a07534cb690c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://rubivina.com/Images_upload/files/42599824209.pdf
    • https://rzfmuhasebe.com/userfiles/file/sikudutotevekavo.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a5c8bbc15bfc6b148daf18c63eae2a6a/lunojuxakenax.pdf
    • http://dgjst.com/upfile/file/57993611565.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b00b38dad---60121373808.pdf
    • http://kstarsmall.net/userfiles/file///76912674501.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/pj97fa4stkqgb05e6d6ijlci5v/77102988079.pdf
    • http://kleiberit.ru/files/file/30894315256.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d5de6cc7af589b2e5347e3a77cefdef6/38232849425.pdf
    • http://alemotta.com/resources/original/file/1848280540.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da393987952---5934930387.pdf
    • https://psychologgia.pl/Upload/file/mugavawulefo.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/wazotodi.pdf
    • http://csc0351.com/userfiles/file/20210626003435_8gix8t.pdf
    • https://pasarantogel.com/contents//files/75181600802.pdf
    • http://bogieclassof67.com/clients/71235/File/vikizatamunede.pdf
    • http://caydinhlang.net/userfiles/image/file/67240786592.pdf
    • http://ahkjt.com/upfile/file/rijuvolewonasopewawo.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b605758b168---4912741343.pdf
    • http://apcmagon.com/userfiles/demewabonaziji.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/utcehd8ian6ihm3nfepemjq2rr/92381148988.pdf
    • http://mosjob.ru/images/file/tebimen.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sausage+dogs+in+air+fryer
    • 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_off0000e58a.bin
d639cab328d910aecd292bc6ce8aef5bcd943fcd0f5d764afc1b004dae08b8f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 17096 bytes
font_01_sfnt_off0001120f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 16792 bytes
font_02_sfnt_off00012a26.bin
6fa7596a32befe1ae0177d94439ce08c1452a0f4e973e3c885515dd200b24c7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A26 10672 bytes