Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3b1b1f305cd8c6…

MALICIOUS

PDF

74.8 KB Created: 2021-09-19 04:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 426b667ac4e9d921e2759cb7f5be59f9 SHA-1: c19ce10862a76a46920ebf0b2f1c8d8cd3cac0bb SHA-256: db3b1b1f305cd8c6e1aa3cbe7f4a2b94c08dac3e81905379377b5608b07a1da1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it serves as a container for these malicious links rather than providing user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=parallel+space+apk+64+bit+apk PDF link annotation
    • https://senfina.top/uploads/files/72051246995.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/losivobobosuwakonovoni.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/46837701959.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/sefusidafiwewaxani.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/pozixepobumuvazoso.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/03c95e6c049044be4b5697e5c572bdae/27999116272.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109161356056166.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/95589918007.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/37032041835.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/85156874318.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459044ee496---vaderobozirugojumukuwel.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/46983941606.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/buviliziwibikepavug.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/94870666271.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/73039289175.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/potasatanesusi.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/66328041856.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/xijifirumotuguraxajig.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/36631148628.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/kazidojelijapevilevut.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7c67d64bd45510cc755db1e8d3c0d7f2/tamuzolusuvamux.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/pugebowizupok.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/xabewanonaxikopewoneku.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/93429304956.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_off0000bdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D8 10624 bytes
SHA-256: 92ff77c3fae69646e84ea2c1d6cdfc1726b7211893b3f2d3964563222c6ed46c
font_02_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 18804 bytes
SHA-256: af9dc0ace385e0dba03e4282ba78e89e594468f28eca17f4ae3153c1e4624be2