Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c456a5a3de7b93…

MALICIOUS

PDF

85.9 KB Created: 2021-07-19 08:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20229a7d5aea67d9edce376654c4e908 SHA-1: 4d7ce9d353b75b81bf9b1c9bd7b73a5b5f9818e2 SHA-256: 90c456a5a3de7b93d0042a9fa0917a8b49d3d972840dc2676e59c4fae2743d6b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated high maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, likely intended to lure users into phishing sites or download further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://austral-immo.com/userfiles/files/ligotujalija.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/217fb5b35c2f775a4e526dc446d97b8d/19834723220.pdf
    • http://s-moonlight.com/CKEdit/upload/files/fenurifi.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3e65ac02839a688d5bae0e1a69603444/nituwasojali.pdf
    • http://badaranquehablar.com/userfiles/files/80808728668.pdf
    • https://fnb-concepts.com/images/uploads/files/towigugag.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6faff7d848---61137843915.pdf
    • http://ideatity.com/ckfinder/userfiles/files/33589368895.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/db0cbceb97724705241acc9930b5170d/48321380569.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c0817b1a7---50609030489.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/74224074145.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a66b9e69f47---90029748375.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/h9u1j49nv6h3s13bmcqutrkrr0/vitagigo.pdf
    • http://mwcapital.net//ckfinder/userfiles/files/48712055810.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0c166eb4c---68543843571.pdf
    • https://seerupit.dk/assens/file/gumijozuvapunavixi.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/tawevipa.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e78cadab206da1113a076418e842a4e9/sijoviraborev.pdf
    • http://ajivikafinance.com/userfiles/file/49218145475.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4540d91b80---zidadanifex.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608265a173519---makumesaj.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c06660c3669---nefimumoliteratup.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/91676716077.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6c6570f9---26906991076.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=weather+for+union+city+michigan
    • 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_off0000ec1f.bin
8e5fb38f43f68c586d5e06853c482d89b08cffb9836607274f41499de03865f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 10776 bytes
font_01_sfnt_off000104d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 16792 bytes
font_02_sfnt_off00011ce2.bin
0d1a0d0cdf7b0ed3287b6f8cf975c4f3e60f1c573d41164b241405e6d309b72f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 17040 bytes