Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54dce8a60eada02…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 06:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d39ffcb2403338b9d915941a3f81bde2 SHA-1: 603aa0ed3a92a89f6aafef2ff2a5519f92acdaea SHA-256: e54dce8a60eada02dd6780a192233317b8f8fe8dd39802174beb5e1042070d12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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
  • 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://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b95fd121e7a68582edefed9c5d8c978b/xenadikakosavupeditodiwer.pdf
    • https://hospvetcentral.pt/site/upload/file/91660218353.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/sujifizirow.pdf
    • http://easyreturn.store/userfiles/file/33455346318.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0mns5as8tiujbfdm4i8aquv0vm/34226164796.pdf
    • https://clumba-indoor.ru/files/files/11357454288.pdf
    • http://booklandbooks.com/userfiles/file/wepazodufiribogoxu.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d56ccada5a---50227332632.pdf
    • http://security-m.jp/tool/images/file/xetokusopisupikuvit.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607731cb348f1---89339961067.pdf
    • http://valsadindustries.com/userfiles/file/wokorasu.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/nv8a5hljfo1t0o3ph385vihq9h/nesexoxirelevew.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7pmoa0asrf872gf5l1jqvrc6v2/55537836096.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/b5mfjg22gv37tma0fvjs4m05ih/gojukixagadakovoxurepe.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ff92a4da---78934387181.pdf
    • http://learningkey.org/userfiles/keloxavujupatu.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/44260254660.pdf
    • http://qca.ch/userfiles/file/28122453096.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63a94caa4---36938118327.pdf
    • https://m3csrl.com/file/xemetezugefujaxulexujufe.pdf
    • http://bike-aholic.com/UserFiles/file/99368678319.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/8b30df13226eee734eb9e56f4b7ff03d/jajokimolebonolajizowados.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vb6+export+to+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_off0000e983.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 16792 bytes
font_01_sfnt_off00010195.bin
875feca7631804bf26d59f0cb7ea04fc2ef73fb4b6884630e9e4971b77b562ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 17528 bytes
font_02_sfnt_off00012f9d.bin
e44edc562bdb0726196b58ac042d0dfa9c3d2d78d580a3246a05fcbfda97b6b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9D 10296 bytes