Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9d3ec85f3fc639…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 15:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e51bcb6aa662aab659e52cc6a18ac9e SHA-1: c37afdde8e24fe2ce01b7204b42f3d7908f27c85 SHA-256: db9d3ec85f3fc6395adf8b4a4fa7678d77b6fdc055a791dac8e0810175306fee
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093043bee35e---26557358777.pdf In PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6200762840.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/12336684741.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/tnnr35c5jh75hvb71mjg3n7s3s/99043872038.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/203fb7b5c65fb0a8e9e1148926fd6c53/xijodoje.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/nofatedofenudasuj.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/fapepotijobawafuroxo.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62e464d7bc---fipekawuvuwubesijov.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/97462808997.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/47802526158.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/saxisa.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30d9965ec6---22497054476.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/05d36de82c1c86dcfe73100024c661a5/89697380564.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/kizimepowepopitexajojus.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/29841934343.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/27293184969.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c619d08d713---rawowekezuzipobaborad.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/24722908500.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/ralegijezoxi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xujesaf.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2231ee96215bc290ece06bb04cbac8a8/mujonomewekusekirejine.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e1226ec7aa3---24137195145.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/73008293810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=worksheet+excel+formula+sumifPDF 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_off0000c959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC959 18724 bytes
SHA-256: 40390df481a2a3bff7219ab93e4f743a5dc6c90d4d2e72e5366d462be3bd2365
font_01_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 10784 bytes
SHA-256: 58dcc1819fb1c5e7b33724665691b3b8cd2acbf9bfb88c4b902f5fe61056a761

Open this report in the interactive analyzer, or submit your own file for analysis.