Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff0d2c8c113a26a…

MALICIOUS

PDF

73.4 KB Created: 2021-08-30 16:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e30450535c4dab73a24353fe7ef82e84 SHA-1: abe9b23702fb49e8f80efa660df4c2dd8d1ff681 SHA-256: 2ff0d2c8c113a26a65b8ef236e1e525d57a44299ee2064bdfd28387062330dcb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://tosto.cl/ckfinder/userfiles/files/noxewowid.pdf In PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/3rqj43otoi1ucq5hpsfrfpgkhq/49109268103.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/57134805744.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/27826605665.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/dotafawomebesola.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/gefitozu.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/98597078975.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210701_F3EF75DEC0BB8C2E.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612347436ea1e---92683138838.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074a35b79960---figoti.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/43437674123.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/44640560524.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/muzuteduz.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d50f7459fb3---tofunevigaji.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/pijowununezeteposutuvuza.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/f59qsbeovrc085d5h4p2ai1jvb/63018344357.pdfIn PDF document text
    • http://kbchina.de/upload/65278326798.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2b06a161d2cbf47fd23da19d4322514b/6589311842.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/96013502395.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a503a3ba8---xavafupopejilisutodexav.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jmjjpbtddk1lv86s4h4n5ou7i3/duguxexedipopavezetujo.pdfIn PDF document text
    • https://tpk-m.ru/files/file/kilupevi.pdfIn PDF document text
    • http://minerva-collection.net/files/files/jozulafurugozurapomumuso.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610657106ecb6---6618632591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+say+music+in+spanishPDF 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_off0000be34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE34 15920 bytes
SHA-256: 4c1187946c414486dade3f14e1dad32e0b3502f666d98f07b9bc05452d679fa6
font_01_sfnt_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 10652 bytes
SHA-256: 1a585eb534adf57d4eb907a4c578e97a2f54c2d0f7fdbe3a6f0b7e6041f931ce
font_02_sfnt_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1