Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10b27a25a988046…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 10:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d00b079076b562f1f06725a38233f65f SHA-1: 40c275f3bc2ff27d83c8bc6d26ee875d65819602 SHA-256: f10b27a25a988046c69903d2bd54206b7b8d0bd6f06348e18e481e92d7dd2402
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/vvasref2csq05ki2gu2i2smg7s/47106501213.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/88781388228.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d1ebbedc27d42d0e997b5aadae205793/kupipidobibumetumoja.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c525ccf1757---85959008506.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac2515e9b---8022204706.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7c7168acddfec4a812befc7f011c3205/93536855659.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/dfa294ebd0787f8db23dc62597e1d4d0/mutupezefiruwofogutejut.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/zaregedevikum.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16094818561d28---40599777396.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/48978283861.pdf
    • http://silesiacapital.eu/data/file/98740781499.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0530e4d29b23a94af7b310eeb3336f9d/55792774661.pdf
    • https://pet-fashion.ro/mm/file/sufovowikun.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266ca82fcf---mukudogimoseragisofifenew.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c4be3db9b---beveludamejijasal.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4gf2fqt09s827d73h2oiovi9o0/zewamurusifu.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/58998089b0bc39cbe44ca37e9b6d036b/girino.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c878f7dae45---xebovupuzanegebisal.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/zalibelilawe.pdf
    • https://kuepancong.com/contents//files/34456532658.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160701b91e9ba2---10928560106.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b40784b96ed---zowepalunonikezuzoli.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c576720f743---63554311434.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=opposite+of+current
    • 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_off0000ec5b.bin
a5f87c7b10e3089de251a0d2b423b714bfe8eaa935a7ac5624c902d16efb9e3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 18372 bytes
font_01_sfnt_off00011b3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 16792 bytes
font_02_sfnt_off00013352.bin
c43a5975b485c99030a672b5ce9acb4de0109a133d44cdcb123d2e764e5020f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 10392 bytes