Malicious PDF — malware analysis report

Static analysis result for SHA-256 044cee0406bbc825…

MALICIOUS

PDF

80.9 KB Created: 2021-07-29 17:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f737c9f31cd9f3b5fe6a324de7a45c6 SHA-1: 8163efd3fd79e95cd671ac511f98c7ad4694e48e SHA-256: 044cee0406bbc8255b7c33694cd689c06b724e8d2c4f69509fb87c2aa3cbd6d2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic firings suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://motiv8workout.com/up/files/pezijekepijet.pdf In PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4cde0e6af387b531ae458d3adee7161a/tuxugenekukizezisesuv.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/wadumewevimumuzuganodew.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b44b510fc6---xizobowivoso.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d6d37efcb258335718d7dc27ae799f5b/tipajisilodemuzupofibo.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/genimamokaro.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/95794626026.pdfIn PDF document text
    • https://webmenuplus.com/images/file/fejadadew.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/42677973380.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c587cba3c6d---78116993634.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58ad3e8f67---gapinew.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/jutarirenufuweku.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/29075369534.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ttga8ttnoa9aguu2aq8cm9rgvl/bupumadazojavixekupib.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/beririnifisevafebuniro.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/51318966621.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e81102cb8e2f71d0ded45b312bedd3cb/4429833545.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/05r35i1eso2m9g6uq9171t9at5/24930229242.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/norinisafij.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073c653ad6ea---bijatiwudedexog.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b639f14bc---kezulegewele.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/tizisawefo.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/87203958378.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/98111098616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=glyburide+davis+drug+guide+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 17184 bytes
SHA-256: 85dfa69a1e7e9e6bdfcec943afae66761a5f7dfef286058bdd864050a5f85bb3
font_02_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 10808 bytes
SHA-256: 7eecacec833e3a781aecc7f6d0b7541dbd8621bd772414686704019015bb234f

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