Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e8a0459f8c417d…

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 05:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dcd71dd5e1be4da83a8bba3dc943ac72 SHA-1: 2dde97000a8009c6e359c92173003dd3a6121f70 SHA-256: f5e8a0459f8c417dcee94455aecf323fbcda1ff23db8361915b6c70af4a5e64a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which are flagged as compromised CMS uploads or disposable hosting. The presence of multiple PDF link farm heuristics and the ML detection strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://grandplaza.bg/uploads/assets/file/99310598537.pdf In PDF document text
    • https://mackbeks.com/files/file/32760935572.pdfIn PDF document text
    • https://energooptima.hu/upload/File/47322398450.pdfIn PDF document text
    • https://birotex.rs/images/files/zuzimob.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/11945156621.pdfIn PDF document text
    • https://nasikampung.info/contents/files/rexaxotefogav.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/19810185869.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/77391475823.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/69904161339.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/valuzowebo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16143f17c2c055---44843078300.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/vukef.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/motuvulowurababagedi.pdfIn PDF document text
    • https://aashianarealty.com/file/18039561834.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/fefibamomipuze.pdfIn PDF document text
    • https://htchninc.com/d/files/namejo.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/30329532236.pdfIn PDF document text
    • https://gryf-wet.pl/ckfinder/userfiles/files/86054128687.pdfIn PDF document text
    • http://tcihk.com/userfiles/gexironew.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/wugir.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/26682037967.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/86672748539.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/juxeg.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/bbbdf9fae194c04bf9bafc9afe75b902/56451781252.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/88972050184.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/99edb4be0b09759668d793553d330f6a/92219684077.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/23224178922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+conjuring+the+devil+made+me+do+it+downloadPDF 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_off0000b5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C6 10996 bytes
SHA-256: b78d4c506a22f4b108674a081a67e3887bce4d8036cbfd67423c59b3199c57f5
font_01_sfnt_off0000cee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 17464 bytes
SHA-256: 76b36fcda95934151af0b26e32b809a5ab9535bee714b8eb1e93c1479cb5dde9
font_02_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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