Malicious PDF — malware analysis report

Static analysis result for SHA-256 33177d7a17ce4bf3…

MALICIOUS

PDF

71.7 KB Created: 2021-10-02 14:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0082434b24a35644f4c3cbb910e32c45 SHA-1: 3a9a02a04a74769c6410d24fcd2d799c9ec84abb SHA-256: 33177d7a17ce4bf36083d4a6eca2f0ed3d8a3cab23d96b3a06ba8c4dbdfb214f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=our+worldviews+grade+8+textbook+pdf+chapter+1 PDF link annotation
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4560a573e---dorovivuwig.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/wukirukibimul.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/2be9e1f10f5acf0f7253f8313b1deb50/lesasujodedowibiganar.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labegupewasekerafinojiwij.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16156aacd9c811---telulodarerademiw.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/75912544845.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/jaduriwip.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/bebefufavobozexor.pdfIn PDF document text
    • http://happy-land.hu/editor_up/90430002403.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/97672114558.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/favatudu.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/limatarobemixu.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/59857973941.pdfIn PDF document text
    • https://grnca.org/img/files/files/vedafometuwogune.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/wujarafipukesafizipas.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/mazutojudel.pdfIn PDF document text
    • http://handgun.ee/media/file/waxitewalapoxixugirigo.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/11889948276148dcc31d1bf.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/50555392695.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16151c39a55b8f---21917570378.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/30461747311.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/jenuteduzuganupe.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/kisigizuxufenolexegokiris.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/bofuvup.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_off0000b3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FE 15932 bytes
SHA-256: a6a6ef88b28a4014617c85690c3865ba1e0a0384c4e4234e084723de79b387e2
font_01_sfnt_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 11664 bytes
SHA-256: 295d5171fb4b14ff6ec7dd9bdabecf0881cc754b11cbafcd64998fd42b4dc1f0
font_02_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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