Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2b8e7068b32640…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 23:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24ffdde88417a9dde3d3f2fc4474be2b SHA-1: ff9052acd9c24e3aab7a1b2ae8e74fb052ba1c31 SHA-256: 0e2b8e7068b32640d9683de89aca37170d7480a9afad5ddd122ac8c649593188
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs. Heuristics indicate it functions as a link farm, with many links pointing to potentially compromised CMS upload directories or disposable hosting. The presence of multiple external URLs suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=sons+et+intonation+didier+pdf PDF link annotation
    • https://247hvac.ca/fabulous1/uploads/files/88642653811.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/60740834.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/pezolubupexuxebaji.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7adf75948---45197165503.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/91843802304.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061606174280554.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/89875075882.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5cc1a4992aebecbc53266d6023288b9e/66859282715.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/topadobipumut.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/dotamekodajabunabiwiredom.pdfIn PDF document text
    • http://ridendo.cz/files/file/bexitevapopixadukadi.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/gerimukigukafa.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0efba738f7fdaf8c0044b92144366f72/sagakuxe.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162337897670.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/poreriditokizoni.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/99516139657.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/fusepegubojeneb.pdfIn PDF document text
    • http://ibb-online.ru/f/file/1527127894.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/26982395138.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/xejedukevenoxexolukuxumu.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/5131282207.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/35d5612ceea7d27a055995f10c0d1dbe/kixomu.pdfIn PDF document text
    • 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_off0000bcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD0 10520 bytes
SHA-256: 3ea8645b27c5d10ec057c4a76dd306d097813332e5b6ebb9856f12ee9deb872c
font_01_sfnt_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 19076 bytes
SHA-256: 1c71f662fcaf5d5862cb2f0c46095fa1385723ea3732c0bb85e65a133cf49103