Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd1832fca6e8138…

MALICIOUS

PDF

73.2 KB Created: 2021-09-24 19:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6efb279b7afb4255a33ceaa97f65e6a4 SHA-1: d5a993a4b5ecbe81c45e0ac3b0c304323d7381ce SHA-256: dbd1832fca6e813844085759f3f635a905e8236f93bf7bfb607c60ee9906d082
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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://skiclubraonbaccarat.fr/pdf/89766634035.pdf In PDF document text
    • http://pixel-pro.ru/upload/file/xajofonirizidopip.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/nopenisidalebixemo.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/90974707329.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613f913cea861---loteginusawonupasetaga.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/bugevadilesel.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/famafuposugo.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210909_043120_6222.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/duzevuz.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/belegakixew.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/53979069749.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/10526397128.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/16649199967.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/19344773307.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614087098527d---tepore.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344116054f5---tepevinubiluwevawedegofog.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/jozerogemivazejuzutegijuj.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///pejelinevofo.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/tadutamovunudupulix.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/toligavifefesokajuwesewo.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/libubomitewo.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/dijemo.pdfIn PDF document text
    • https://mmtours.si/uploads/ripememitab.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/78392261653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+shot+timerPDF 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_off0000b7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE0 10284 bytes
SHA-256: eb308aac0c9fe1909cc8bd5bc6f2ee460bf6935e6a430a4bfdca74d05ec9a38c
font_02_sfnt_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 18984 bytes
SHA-256: 84d4c63ad718d98446e7aa65b17eeff1ebef821a870ba594f5ead0c9c68a4939