Malicious PDF — malware analysis report

Static analysis result for SHA-256 5156f9c4879173f5…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 05:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dda15194ea7004a4582c0e5c0819323a SHA-1: 922d6b74cda3d4db4924c63b3d6086ed56a790d4 SHA-256: 5156f9c4879173f5510e90d1ccc14c9975e0e3ce604154f183a17443a15b5b4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites hosted on various domains. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to external, untrusted resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/95a28c061c3a59d06083c6b08612ec7f/85014439036.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jtm8u9jm4o8fqfi31unc9sdlhb/bewotodatusamupuru.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/c3j8k97t04qkc3d4pci4sq8a94/lubekosegamowisoze.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/28474981530.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/64109961433.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/65493177959.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/35696846860.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/88849513292.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/lojobatazexolivav.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/lutajegofimeworukaxebo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610adfaabf22e---27972846322.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/solitufifebutuwa.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3302621008.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/6215196893.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074329510e36---tivovexekozodo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078042173c83---nasonufilesetakev.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/57971923169.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d841dfcfca2---4256073702.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/15167702984.pdfIn PDF document text
    • http://camwater.org/media/files/32618144538.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/pigafuwogovororebotoguw.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/mafofolunesozoxonixamilak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=use+excel+to+solve+system+of+equationsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 10932 bytes
SHA-256: 5c31b2b4789d59d131eeee985ad79a7ecaec8291eb633e54cbcc9e442411691a
font_02_sfnt_off000100b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B5 18088 bytes
SHA-256: 6c9e7d2c68f5b4c0e18cbd1e976868f37a0456bfb4594041bf8b7f1e28430dcf

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