Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad828ed79e91d376…

MALICIOUS

PDF

91.8 KB Created: 2021-09-14 10:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8dc019483c85be9e8bff522cbb56b52a SHA-1: 553d66496437421968134e3570dfc1fb08b96196 SHA-256: ad828ed79e91d3766d42837bd77c676489fd2ac3e90e403a24378e80a382adee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple external websites, likely for SEO poisoning or to host malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest an attempt to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure points to a malicious document designed to lead users to compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9523

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c7dd49ab2c9bfd165be6e5283f078acb/91370762028.pdf In PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/35670595217.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/10768247667.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/58598538184.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137873b3e604---51834319760.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/bofufopabugarep.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/rozopenegox.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/xuzenexofoteb.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/21866238707.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137456ee8702---nuzonujema.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/76e116cd7d9bb33c58f5edc2ab8a3f8d/voxirebi.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/mutova.pdfIn PDF document text
    • http://labradory.pl/file/kafepukarevoxixapuzamipof.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/85671159210.pdfIn PDF document text
    • http://stattus.com/assets/file/rafimibewiwowosipita.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/69977922375.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/rowokapu.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/nelixojidugekodesepudi.pdfIn PDF document text
    • http://haai.org/upload/file/beraride.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/6034462581.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/buragapefonadipagupokames.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/73688492629.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130f21190313---93885312667.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/30675252594.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/gosigotiguvowojewox.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/90675585806.pdfIn PDF document text
    • http://naviway.su/upload/files/gomasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+9+wps+connectPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F6 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_01_sfnt_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 10532 bytes
SHA-256: 05512b0f04f9f4a0aad76437e203888c2e631db8330da2ca1b8fa17b14cd5996
font_02_sfnt_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 24984 bytes
SHA-256: 5f4baddfd3179cd405219d59404c7d31279d21c8a80d9b89cf8114a24f8f3ef2
font_03_sfnt_off000131a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000149b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B2 16464 bytes
SHA-256: b2721f9e821863104c9ac64d6c67f33463a43be3b5b1da8a8d678451a8bb7625

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