Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2c3cf90b7cf95a…

MALICIOUS

PDF

99.2 KB Created: 2021-07-16 19:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8caa98ebeeba29077b7661ba93538296 SHA-1: 09e99d440f2efca3f2216c25ad448c6419ab4710 SHA-256: df2c3cf90b7cf95ab983616e7dd484f4c35936b762b745eb72884f3aa87e8ed9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of multiple external URIs and the 'link farm' heuristics point towards a user-execution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae522dc047d---xeguxafoson.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/xazutazetavetan.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/48566092364445db8ae8b6d2d46a3911/45605073162.pdf
    • http://panegovernance.com/ourprojects/chowki/UserFiles/file/vugaxarebom.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/dep61o2opjscu8u2tctrfcd71c/depafipesapujajoto.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d47dc7e04---75502237723.pdf
    • http://nessium.net/userfiles/file/95371589253.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607854d4d7ba7---sajozuxufekukivakit.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f800873581---vudedowizokat.pdf
    • https://atphp.ch/userfiles/file/pivobewabot.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4133103bb53a5a1e2192ca3eee12bf99/kisitep.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8433ba5569030b06b3f8c00b73812191/rezuzonodoviwapiwukuwuxim.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66e9c91f12---polenivubi.pdf
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/22146240109.pdf
    • https://rcot.org/userfiles/file/13257898449.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/fabimimoku.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/94cfcdc1a709c27ebb7fca74576fee00/gepujigol.pdf
    • http://coinproject.com/userfiles/image/file/kixili.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/60621008184.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/be76ef9dc5479ed2df3d8711ad005948/71545492926.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2934b970d---fegabubanip.pdf
    • https://dichvuketoanvn.org/uploads/files/47335473885.pdf
    • http://thy-environment.com/userfiles/files/15437096882.pdf
    • http://logistra.fr/ressource/site-image/files/91777097952.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074631f1a90c---18869053547.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/f5rq9t37f664t9kvsfb39lgls1/sisuwokiw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dvt+compartment+syndrome
    • 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_off0001206f.bin
8d36a3eb829b291a0079652b9a69d7e16cf157aa62d4645ab87d4b44b82dd1bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 17636 bytes
font_01_sfnt_off00014eb6.bin
5eddbfe6d2f72b0e94271a84c450af7a3e46b7369700deca00f1b540679f1355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB6 10720 bytes
font_02_sfnt_off00016760.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16760 16792 bytes

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