Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b351a6fe79fd5fd…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 19:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ea7d81048bdc0a195e7eb6bb33551aa SHA-1: 37e4224207aac2b9c5ad9c6b47cdbdc8cae0aac8 SHA-256: 6b351a6fe79fd5fd76630788566db5f3c8a9454d17ca4b21bfb8dcf4d194111e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of multiple external URIs and link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://catamma.ru/uplcv?utm_term=flight+radar+24+android+app PDF link annotation
    • http://mobilahomedesign.com/userfiles/files/85194299149.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/gujugagep.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/busitav.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/terorajud.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/lemujofim.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-6/20210906092027658053.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/72375414419.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/14390409227.pdfIn PDF document text
    • http://simonide.org/userfiles/file/21993993805.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/ladawudixutopedenof.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d597aa95---49863839088.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ade0405fb---97060541051.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/nirodamulukurevofap.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/tufovukixalaxiwopa.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/9e84f3b2ef7eea900c0ac71d88d64cc7/86510005697.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/babanijek.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/88317552995.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/vakovova.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/59589294800.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/lubafufojab.pdfIn PDF document text
    • http://imoroz.by/upload/file/5983681004.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/vedigapigadugi.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_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 10548 bytes
SHA-256: 97471de36e02e3d177fc147f4e30583ced41fc4d774aefef7525eb0f7e19e922
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 18256 bytes
SHA-256: d3678a613ae44f2ed012697cf589c9baaf43136a6ce1b3f26968d1d38d3c790e
font_02_sfnt_off00012c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1