Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfe3767d024e4f4…

MALICIOUS

PDF

84.9 KB Created: 2021-05-28 13:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ace0106db82b6a2d7f631c974a88425 SHA-1: aa79c6e5713bc306c7ca0342fcd1bbe36dfd1112 SHA-256: 0cfe3767d024e4f4010d8e2b1254469781fb8ae8892999bc73e2b791a9d94db5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7904

Heuristics 5

  • 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
  • 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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vr161a5g5helgg63ljtnrdodq3/95278644780.pdf
    • http://dermalab.pl/userfiles/file/72334416675.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85b726253---90166105161.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0221c64efd1515f9beab285ff8f81390/4908411439.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/rlavvu9fj9c27f3du2ba9hjoi2/gezapoxowakamubori.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/h2lr46lkicdo54gvrunf50fnpd/20330360750.pdf
    • http://www.aqsclimited.com/EditorImages/file/55501430100.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38a201e2c---15252382708.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7eccaa787128d4ab58bc82ca8c110c05/pimuvuzugasakelotil.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2d715dd5d9b5cfe335176b3dde608612/fulolasusifasa.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875ce43cc43---poditudetotununa.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160719d8d51efb---72496223450.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e6b78ddd7---35060413836.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4279f40377fb76c4a5795af94ee1b685/59201343125.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/cdd61be969a5ca183108b9051b012b07/lenamedaxifon.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce922f01e---nonipaganif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+does+a+schwinn+airdyne+work
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001223a.bin
d3c515ea7a56a6d2d3fac91d7359f5c6f748e99c3ff697ac95c3ccbce1c4973f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1223A 5212 bytes
font_01_sfnt_off00013403.bin
8674709be3e467b3707f66e8983b50aa62583859149a45d40f92b956b7ec00a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 10868 bytes

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