Malicious PDF — malware analysis report

Static analysis result for SHA-256 d840a0ab7499c499…

MALICIOUS

PDF

78.1 KB Created: 2021-05-28 17:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2f0020a28f2eb65267cba2ed4e00021 SHA-1: ad4aa91b9733f9c10cec1784edbfbce83a0e17fb SHA-256: d840a0ab7499c49932dca0f596e0d1af6806c80e56abef0dfdf11f33e77ea461
154 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains. These links likely serve as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7677

Heuristics 5

  • 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
  • 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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7fce680533e1018079b278969faae036/30638408731.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090772c62c16---98055403131.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/robesumerazukam.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71411003ef---31049294142.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c11a8cbd71081d0684662a9b43d82d14/53299630627.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e88157cd6---kadizokikixogapu.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3be58696---10176971710.pdf
    • http://kapelski.pl/userfiles/file/27361254525.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d5cc46c99---divenelerarafimufi.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/611258feaaa6a7a4c7ff3c34ac1c5900/41021075327.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7af595cf---wuwoginusosakoduwagepen.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16096310926908---25596840493.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608708523181c---92946308701.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sony+receiver+str+dh500+manual
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff54.bin
16c6d2550e81bc36bcf4cbea92ec115c9c98156e9b63fb1aa77ac0230daf81ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 5592 bytes
font_01_sfnt_off00011227.bin
203c4489b6ef5d5ce608e2742314cdf941e7960ec6bd1f085ea1c4986a7957b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 11436 bytes

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