Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bb19d6c77af133…

MALICIOUS

PDF

84.3 KB Created: 2021-08-22 02:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 229f26afa607c845a111d0e663afaad9 SHA-1: 45f1fdcc9cdcddf0e83ec8ad86a81250d1431e2b SHA-256: 18bb19d6c77af13356da4ed6d1ab580bd2241cf9236c70b691b1e741c80e3e28
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077271a51b91---82628388124.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085856b409e5---52058641906.pdf
    • http://thayloilocnuoctaihanoi.net/upload/files/tajiko.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/04df5788daaab42db79eca4a9d63a18e/ramagesev.pdf
    • http://liga-stf.ru/i/upload/files/37379367304.pdf
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/77342720334.pdf
    • http://tks-forever.com/upload/2021/08/16/file/74549427572.pdf
    • https://principesgs.com/userfiles/file/70005818659.pdf
    • https://kfmaccounting.com/webroot/img/content/files/tatodizupep.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ub5pshjum5sellregcqtvqruj8/43531477407.pdf
    • http://tajeer.co/userfiles/file/kuxegifafozopapok.pdf
    • http://denprokhorov.ru/images/file/gatatakoxen.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210816225345.pdf
    • http://rcmo.ru/upload/files/vewivatorunulabafoju.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ca40f05050542e453dbb4d2afed62153/84359607081.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3457f716379d2024b9c0ae51a0b21633/nukosizod.pdf
    • http://ipceurope.com/assets/file/vufopoguwajuzawati.pdf
    • https://hotelmitrutarija.com/uploaded/files/48333068862.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/125d550ef09130ce1aa1167c38ae33a2/23142948661.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08939df82d---somamowajalatuj.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/71793066187.pdf
    • http://chinasoftcore.com/userfiles/file///nuvajupufowidakabuvibu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=como+se+forma+el+enlace+fosfodi%C3%A3%C2%A9%C3%A9ster
    • 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_off0000e103.bin
0a59a6c8e221141f39fbb3f27806e4b3b5c1defb0b58e59470f221f801be58de
pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 11396 bytes
font_01_sfnt_off0000fb1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 16792 bytes
font_02_sfnt_off0001132d.bin
4422695ce32e02fbad00148f01cfc12dedd2494682b67cd9c7bae1dbabd9ffe0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 17872 bytes