Malicious PDF — malware analysis report

Static analysis result for SHA-256 c907f9c7dba5ea62…

MALICIOUS

PDF

84.6 KB Created: 2021-07-20 13:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51f30c1a33ff9d823e51a533f70d7d7d SHA-1: 4682972c1f47556f987431c2616a383fc485faa0 SHA-256: c907f9c7dba5ea62191375d4bcd5ec5dead4ea9a5d679d1e3dd2f99103b7b999
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The file's structure and URL patterns suggest it's part of a link farm designed for SEO poisoning or to host malicious content.

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 http://palirna-frydek.cz/uploaded/file/54896306326.pdf
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/bepunorazo.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2d536e4d3c85aa127c12583dc957aa41/rerixewolibu.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7c7d877b36b4afb04bca688645436419/xuwosaxiviwuverokik.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/74adc4md4tn3gblkanij371pk9/96500682638.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/p2der01j7mhvgan1abvaepth87/tokavefalun.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8230dd25a---muvemofe.pdf
    • http://goldenteriyaki.com/uploads/files/18609200049.pdf
    • http://drapa-technika.cz/UserFiles/File/kasezirirevowatalagibedus.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160944df382ee5---xasazure.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/934546221fa9129b4d00d21acdca3043/nolukezokovagatojenubiwax.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741637b473b---nizofalezaxiwubila.pdf
    • http://fabienneblavier.be/upload/files/towit.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2ab5f39441a1bf5a98a561e8c7617ea/fodariwane.pdf
    • http://runo34.ru/attachments/file/4471014263.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/qgucveqf7t0t983286604atflv/vevenefupadototanifetoz.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0fe885e77a---tejovafugowujoxisinudeduv.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f3d861bf6---tibofoxidiriteb.pdf
    • https://ajitcoatings.com/uploads/kafopafoberonubolekuk.pdf
    • http://cosyromania.com/media/file/mejiridugefemaxutu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=scooby+doo+crystal+cove+full+episodes
    • 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_off0000e35d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 16792 bytes
font_01_sfnt_off0000fb6f.bin
ebad491c8e61d43e90aab893a6e7cabb94b7aec3ba4b8593987b080039e97331
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 18788 bytes
font_02_sfnt_off00012bbf.bin
385a9abe0982812148287d914c8f2f83e0860151004a1354c052e5bdb3363397
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 11004 bytes