Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8f656dcdf9a495…

MALICIOUS

PDF

93.7 KB Created: 2021-09-21 19:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cbf77e4a0fe9a9a858d3b0f48cdbbdc SHA-1: 63dea4a8f2154bc0df5f02f0ed1dfe5fc371dfff SHA-256: de8f656dcdf9a495c58d8e5d4ab2e030c643d9e5beb427d9997b179108eda381
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, embedding numerous URLs that lead to potentially compromised websites or disposable hosting. The presence of multiple links to compromised CMS upload storage further supports a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://ambalatender.com/upload/files/55976867972.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e301bacce46dc0761e5c71c72cfc98b5/79086353900.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142655d47065---gukokesixekaribatanif.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/51033042598.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/11919929476.pdfIn PDF document text
    • http://vucert.vn/uploads/files/bofeponaxevekenokifatuv.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/99461900442.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb859346d6---90411295785.pdfIn PDF document text
    • http://parentini.it/userfiles/files/46679084430.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/60039757093.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/36317170397.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/10741762203.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/gexudimujejepuvasup.pdfIn PDF document text
    • http://elitacasa.it/images/file/52621042187.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/68297803150.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/59218833591.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/8c3f4e8857c734d4f801da21f772a230/dukevifenap.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90146113352.pdfIn PDF document text
    • http://potya.com/felafekazokuw.pdfIn PDF document text
    • http://jawarakreasi.com/file/80792947499.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/61529054619.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/95906735838.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/bojoxokunogofafozub.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16139f92ce5f5d---vunutu.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/pubonodok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=avatar+2+full+movie+freePDF 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_off00010c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C32 10368 bytes
SHA-256: 1155684d37dcd460100d6ee2bd94da3d4e1052810992bdfd7ed4f413759cc9de
font_01_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDC 17660 bytes
SHA-256: 4c3b52fe1e0d3639b211acbffcd8d74a068a25c04fb5d9514c2ce2d2638d9197

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