Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd72d4f222f4441f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 06:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3601a3b7117754719216f67ade0e3ec0 SHA-1: 26460ee9de7a766d0bf434e2ec4cefa8aa8115fc SHA-256: dd72d4f222f4441ff4dd8a1ce9c928b040b6f2648f200d3cf0c1a4e8fcf32bcd
164 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://andreaslasnik.com/data/files/lenifuzufetatajifalovajom.pdf In PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/darobimijakenufaletotev.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/kujirenomenabesori.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/lezeposonizipiduxo.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/35283071259.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/34333964694.pdfIn PDF document text
    • https://tebra.si/userfiles/file/rujer.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/86379953625.pdfIn PDF document text
    • http://tajilin.com/upload/files/34203500640.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xumupazujigapujugulojoxi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136475901413---92780179503.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109041457362050.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d15663f2a6---21691598980.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/timugexinekexijewuvoli.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2639bfcb---56123142563.pdfIn PDF document text
    • https://videoeffect.ir/data/file/bawejet.pdfIn PDF document text
    • https://33mobility.net/uploads/files/92909583576.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96251590553.pdfIn PDF document text
    • http://4bx.pl/public/file/zowexoradekuvarax.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/dutaxapikafiz.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3b4b01f1c4dd8b92f54b5c6fdbc86ac1/buwolemivimarelazug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dead+target+3PDF 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_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 10068 bytes
SHA-256: 4478f3e2f4fe60c5ebd55d69f1caa7bd111fddc32e61e81a22de241d72efab0f
font_02_sfnt_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 18352 bytes
SHA-256: fe48818aff755f1d487552b8fa320e2fb29b352bd16740af5fb7c7ef5b6c1041

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