Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d24696a3d93a3f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 22:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd1ec287bf3315477854e5b9d6e45242 SHA-1: a67eb76e57e1854421daf2d5f9ed704cad81ed80 SHA-256: b4d24696a3d93a3f80f690e913e9fa7c9540799779528bbacea8427914840005
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0ce605e8---basedarijebilisurus.pdf In PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/167ee4167b14781fc5bf768851c2e36b/183904693.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/41705281571.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/gamerewivokejalofudemu.pdfIn PDF document text
    • https://naoshima-habitant.com/mibalufep.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/1d94e2cc72f8c6d6ce7d43d43c9dadb6/71492101759.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/nifazopurijuvovaka.pdfIn PDF document text
    • http://www.emailposte.com/pictures/fapazir.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc4f85acfdc9e3b80dacc52dcd265f10/xuxatozo.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/rukosaliralujariz.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160983d4d43eca---timevumogitege.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5cfb3da58df9ec4487d021d704ae36ff/duwuvavosivulozasoba.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/7131292665.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/16337152453.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/r21qkq4c4dr9mn0h7soqkp70an/91559315606.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/dibakupawufujavowamoxa.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a2d49b2e0---tetodulavum.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d9861995d---surazodigarote.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/24c361e18e8616786a70a284a14d7dbb/12191593132.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/dikigokopevixak.pdfIn PDF document text
    • https://artenika.pl/fck/file/98957209169.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/bd62bb1921dd8206a6e97ffff98c906b/jonenaxageje.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609110a28a353---40069610118.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc08b688e1f---xobesifulivur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=never+ever+getting+rid+of+me+sheet+music+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/16309efde46004fd9c2657141e4828f4/pomiwajewemiwonojo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 11000 bytes
SHA-256: eee9a0fd32cf60f511f6d26c8e7f72ac69ed791667e39fb0066500093cc82f61
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 17624 bytes
SHA-256: 3883961292285d56e48d1ae43823412064160fe534f295ee67c68ffca6717301
font_02_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1