Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd53bb6c79d5fb4c…

MALICIOUS

PDF

81.0 KB Created: 2021-07-07 02:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a2db341de738a1b5ba9c096cc622d7d SHA-1: 73c89423b22c19278d575cf8aec917bf467c674d SHA-256: fd53bb6c79d5fb4caa0fb4edc6ee61973b5479f6e9b26bb3e65b8b73a9649721
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, specifically targeting the 'formcraft' plugin's file upload functionality. These links likely serve as a link farm to distribute malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2fe48b8a5---91468933258.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa0dce4ac1---vizobolatiz.pdf
    • http://school19-zav.ru/userfiles/file/88006052461.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a017f108f24---fumobavabe.pdf
    • http://jedwines.com/cmsCart//upload/file/41880526821.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f65aa117d---dumogakibopezuzagame.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/fasakegabobakebodul.pdf
    • https://annjulieskarpmo.com/userfiles/file/raxamaxowabisiviw.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b110d0504a6---34018696795.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nrn8dq2lf76r3qmmkl07shr8e5/46443814345.pdf
    • http://opusincertum.it/userfiles/files/39400220412.pdf
    • http://gemculture.com/userfiles/file/88116123510.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/30f36007e7bf316693365fc6f512f2fa/71605533168.pdf
    • http://reicar.dk/userfiles/file/nudimaruteroxaributi.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5a760340---nazojazakokovojuw.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735bf2cfb3c---kewujukutupevobor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=10am+pst+in+gmt
    • 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_off0000dc48.bin
4befa05e4f1fbc97ad5df08f345a02f4f8746ff0ac18bc3f99ddb707075c31cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 10276 bytes
font_01_sfnt_off0000f365.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 16792 bytes
font_02_sfnt_off00010b77.bin
768e46a366782fccf46519f1e9a0ffdf6ed57a1404a58e316ba9e8896c06e116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 17048 bytes

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