Malicious PDF — malware analysis report

Static analysis result for SHA-256 46991a65ec6c4e8a…

MALICIOUS

PDF

86.6 KB Created: 2021-07-10 11:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc05dd8ce7353039bc0b2bd2b6d82478 SHA-1: 43c5eccdf312b3fb725909b26ec177e631ee7636 SHA-256: 46991a65ec6c4e8a7cdd4efa330935124a3435d07b3a0399c56a80ed91fd74e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1ec8991e8037fbe17b0865e8047258e8/zofiforasige.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/95628718592.pdf
    • http://banlinhkienlaptop.com/userfiles/file/gavoxuv.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c993611de48---fezedaguvagebilalogeber.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec2715761---85544812415.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/mqkqhjddo4lteula9e4mpht99b/23559545794.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/dd1798c1157afa7d7cf5b9f0426e225e/23723553234.pdf
    • http://murphysbeads.com/clients/54316/File/23792242466.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda1ed003ca---revibi.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f84413336f---muzapugizoxepenaza.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/nv6ptikvvsic3v0iokotj83611/silelab.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/08a0ec2d49344c66aa70e5d5cd9e7698/lufesimizepavu.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/23ee1c3c3908e525bf65aff977a152eb/25970895736.pdf
    • http://php-lounge.de/userfiles/file/88271366354.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/bizixawitejawutivimum.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6871266b44---xafenimulina.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b5ac12c04---14195324024.pdf
    • http://7tec.ru/userfiles/files/64591786074.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/7ed204a6dd5117077ddea48f0b31817b/22540187798.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/d6ea41314c34f68954befac30e131454/wekubikirobekir.pdf
    • https://mudraconsultancy.com/uploads/files/mujisuxedewigegatomopujo.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d47ea1bfb67---50171992316.pdf
    • http://littlepearlspublishing.in/data/eimages/file/nexanivodilida.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/09088ffde1981964f5babcc68259a670/mageladotaj.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/05e6e8f5f943ab73a6341b1b41e7e42b/taxikez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=any+file+to+pdf+online
    • 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_off0000f113.bin
dcba12855ad25c1466c1b8df97e57ed8763767dea183875d6aca3fb9d49910c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 10156 bytes
font_01_sfnt_off000107e5.bin
8b6175903383d280599050a26af2fb8c6f694d2d3f441b153811542b25ae2f81
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 17232 bytes
font_02_sfnt_off00013556.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13556 16792 bytes