Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a2e3dfe0809fb8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 07:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dded3024bd91d527e649c68b4f108538 SHA-1: 98ac1231e09a55c43b3cb91df524a089e699bb13 SHA-256: f9a2e3dfe0809fb84af45d2ed36e4bff24487dd3b39145b59ccd41e8965893d4
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to potentially malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397a691777e---92399126633.pdf In PDF document text
    • http://jl-vacuum.com/upload/files/98588331643.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/tetudekosanunurap.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/95279179468.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/lopumivajekawufuxozofulij.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/31317527086.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/dosajoxekusuvapusuvo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16b205236---16347619687.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/78575323346.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/vutisonewexa.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913151354.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/vexodapidarivofawokam.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e2a0490a---tikesizulevofege.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/jefaroloxadugu.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/vurorisol.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/21898300588.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/10360612435.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/pited.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/wipupevugizovew.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/vubawipiwi.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/tukejesifimajawuxedis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=big+nate+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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 10292 bytes
SHA-256: e297ca3eb22c10f00b46789e62ef8f37d6e79acfb60c26e5ce0c7f22ec5dcb6e
font_01_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 20868 bytes
SHA-256: b37b79c300b4583be1aa381cf6a055f1b44309acc8014b9ed35040d8ae9ad6ce