Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ece92ef388e5790…

MALICIOUS

PDF

69.9 KB Created: 2021-09-18 11:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf4fc60c89686a0eca229564fcff86f5 SHA-1: 8eab8a612b7a30728cac256ad0bd819b46a03b17 SHA-256: 7ece92ef388e57905ea878630bea1bcc8ff274b0fa2efe8b9f3fe469b08c4d5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS uploads. The PDF structure and embedded URLs suggest it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=facetune+video+for+android
    • https://lenaoyunlar.net/calisma2/files/uploads/sewem.pdf
    • http://master-br.ru/img/file/jemunexikegaragi.pdf
    • https://peoplehelppeople.net/uploads/File/nixamozemibovetitox.pdf
    • http://essentielles-theater.de/UserFiles/File/kipakesekaderasaziga.pdf
    • https://livre-d-art.com/ckfinder/userfiles/files/dedetujifixoxepob.pdf
    • http://utcsp2.rustyramone.com/uploads/files/98982144506.pdf
    • http://yildizteknikelektrik.net/resimler/files/51097222525.pdf
    • http://atthaya.com/file_media/file_image/file/19336010689.pdf
    • http://sdv.sk/userfiles/articles/file/55248274829.pdf
    • http://cbstav.cz/file/moxuvedinuvizajap.pdf
    • https://nyirfa.hu/uploads/files/dovetobe.pdf
    • https://glamweddingdesign.com/userfiles/file/fisomojo.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c483672fe---migugiratifuxiwufu.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133008d90a13---wulutolil.pdf
    • http://mos-craciun-inchiriere.ro/fckfiles/file/banoxoramepube.pdf
    • https://mrdak.cc/uploadfile/files/85627923122.pdf
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/tanukogatap.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/nocqgjjrv57rorskuhj25bbj0j/maxataxuzuwogon.pdf
    • http://hantechwelding.com/userfiles/file/2021090123212973499.pdf
    • http://vector-mebel.ru/uploads/files/rogamisaz.pdf
    • http://karate-talence.com/newsite/userfiles/files/gudogonenorawesuni.pdf
    • http://screen.by/images/file/zuginaletabutiv.pdf
    • http://bc-arman.kz/ckfinder/userfiles/files/18377390114.pdf
    • https://rowsontw.com/shopadmin/upload/files/31803907095.pdf
    • 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_off0000b4a6.bin
6a3597215ce683a28931c4baca6f23b0f6ce70db345992500c50a426317c17f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A6 15412 bytes
font_01_sfnt_off0000dbdb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 16792 bytes
font_02_sfnt_off0000f3f2.bin
c6995adab0d5de1402102212209bbe64701a586cf4654e145e582bdc3e1e34c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 10396 bytes

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