Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2bcf53135819012…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 05:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60dda0d4e2c40ccddcfe92545aa70006 SHA-1: 4c9703212b2b34cf169be88fcfe9697a0a4f85b5 SHA-256: e2bcf53135819012a2c7173b5052d1048dc2a727cea9bac3e45bf89bab086dd5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://mp2020.csysadmin.com/ckfinder/userfiles/files/71015104496.pdf
    • http://ascensionchina.com/userfiles/file/28596769967.pdf
    • https://smartmedia.ro/app/webroot/files/userfiles/files/zolibivezirezadu.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/o2m1djrnhm0k808kcoa14f7uab/55568066472.pdf
    • https://readandenjoy.ae/userfiles/files/46344756093.pdf
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/robavinux.pdf
    • http://getsolarny.com/userfiles/file/letotijoferugiz.pdf
    • http://fmmvn.net/userfiles/files/78207200427.pdf
    • http://digitalqwerty.com/ckfinder/userfiles/files/22216047878.pdf
    • https://priscar.com/documents/files/gisatatebeko.pdf
    • https://aczv.fr/userfiles/file/26119856549.pdf
    • http://seychelles-resort.com/images/blog/file/90370684746.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/35454414913.pdf
    • https://vrindaindia.com/php/joseph/uploads/file/xiwufixatavo.pdf
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/baxolejikolos.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/64097452584.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/fedowipago.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d1bbe540---vugasalalasufobemolomi.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/wogevuxogodokafitiposa.pdf
    • http://thebankcardservice.com/uploads/files/bexoxazikaraso.pdf
    • https://sme.bankai.lv/ckfinder/userfiles/files/52796017222.pdf
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/71701980801.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pl07dtipdh1n2b08023m0aeigr/niguse.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=iphone+camera+effects+for+android
    • 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_off0000ae4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4F 16792 bytes
font_01_sfnt_off0000c666.bin
6ef2535f4d8b8c691a459187bca32441133e5c6728d5f4bef8a13a27a7113460		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 10788 bytes
font_02_sfnt_off0000df03.bin
b376618ca62ce5381017e26cf3994649dc5b41e94826629dc9a721d9495dd671		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF03 14684 bytes

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