Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb08b33988c390d2…

MALICIOUS

PDF

100.5 KB Created: 2021-06-09 18:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54e1e576f26eb77c780a3a8d693e2e0c SHA-1: bb0daafe7d3a7daa5fa557d182ea0b8971247929 SHA-256: fb08b33988c390d2d3b12693fa61f704fabc6c51d2ec5c3577ff2f1090fd24ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through deceptive links.

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 https://medvor.ru/uplcv?utm_term=kiran+ssc+mathematics+9500+pdf
    • http://sklepjola.pl/userfiles/file/58067608977.pdf
    • http://caratow.eu/userfiles/file/nezemusetosutewuvod.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aba29f0ee2---xadamemotuku.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf15ffb1f70---43371020834.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7r87eg4n56uv3rdn1sn4gntqkc/47567989181.pdf
    • https://securityguardsupply.org/php/uploads/file/dokipomiluvinimenujek.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/45804220255.pdf
    • http://bortran.com/upload/image/file/20210528050201.pdf
    • https://alajuusa.eemedia/contents/file/takitivajor.pdf
    • http://activesolutionelectric.com/images/file/ranovi.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1def8dc28---71320587762.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/olukjde0onlbre319pbqmrf43a/29565585079.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828bd3b3bbe---68101341380.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d327e2d90e---wazijogupatutusowovibi.pdf
    • https://batikatravels.com/userfiles/file/guboxegifunuvedekupu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • 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://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010011.bin
13b12fac7dfd5684c3be0490a9524608dd66456badbaff5b9ad9135d141daf22
pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 5756 bytes
font_01_sfnt_off0001137b.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 3720 bytes
font_02_sfnt_off00011ede.bin
5d309a36b198ef8ec0ae2b6e158a0be93b691e2e44a9a41f05d2a557d0c78515
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 10656 bytes
font_03_sfnt_off00014378.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14378 16164 bytes
font_04_sfnt_off000158ca.bin
96b614305a3b37e1abddefdfd9ba22866cf2574f5085ee1df4b0c01c51388018
pdf-font-stream PDF embedded font (sfnt) at offset 0x158CA 14444 bytes