Malicious PDF — malware analysis report

Static analysis result for SHA-256 69141f756c5df6b6…

MALICIOUS

PDF

93.0 KB Created: 2021-07-03 22:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d239624ea0854ea0e86c7158905fd32 SHA-1: 055801beb3aba9d685eb9059ab1e967d0a0ba733 SHA-256: 69141f756c5df6b6d483e593aa807988c679232084cd2bec8d10cdd254ae16be
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the link farm and compromised CMS findings are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://simonide.org/userfiles/file/82538201464.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/65058364268.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf2e75000---89832006511.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e5106bd10f302d9681e7205cb12e495f/pozuvojiwenewaderi.pdf
    • https://pearproperties.in/userfiles/file/sagumanikitisebuki.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607c763444a15---32088507810.pdf
    • https://clinicscrm.com/img/files/52707036814.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948a49f07d8---7868692369.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/xofunixabaxexux.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d991dbb8c9c---zinevu.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/q9tcv36mncs0q915ga6re872jn/juzakukatudobowumenodel.pdf
    • http://reicar.dk/userfiles/file/firenuze.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609045f1b31ae---segoba.pdf
    • http://tms-operation.com/upload/files/runemirub.pdf
    • http://freeski.hu/freeski/file/funozivegune.pdf
    • http://charivne.info/images/file/83464777562.pdf
    • http://sskj.pl/userfiles/file/35403020485.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/03d31eb6e78f3a175ebb2b0e876beccf/tozabizokej.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/aaf36a70d03e8dad12dea9e174118e63/sirisisatawab.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/bbde7938363d03ef9e2de52647108f33/vuwurijabadikabeto.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160705fe2b5e8e---14865583168.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b982ef239e3---34327072861.pdf
    • http://coffee33.ru/archive/file/fimimavawulujulo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=most+wanted+psp
    • 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_off0001087c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 16792 bytes
font_01_sfnt_off0001208e.bin
5e4d766d7f698bb89e5da5a61b5dd28c2e4429d9c981a0e4168823a793490178
pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 17876 bytes
font_02_sfnt_off00015030.bin
68c1d9b431088cb20d785cf0da94f3e2be740e4d56028e6c4cc98eca235d297f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15030 10228 bytes