Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b621d4aa24496d9…

MALICIOUS

PDF

75.7 KB Created: 2021-06-13 20:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0257073a2c317f53705b700545a242a0 SHA-1: ebcebfc84a394216a3e78cee9c73c1945c78d1f7 SHA-256: 5b621d4aa24496d93b9c503c9163682c9e21e241b2635a31d3153dee677043c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to watching a movie online, which serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=singham+2011+movie+online+watch
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085011d8f018---vakamexugiwipibebisoputub.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160afce768b554---76064721609.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607faeb5e73f5---xepimozoworaxuzaxigox.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d635f4e7480a93dbf884c30cc6d20e41/zamujeparomonimupetifin.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0428e542bf---xuxufijiduzegokududimu.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d45195be---52869185847.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f625dc33e3206b65c1721c979586cd02/22853954120.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7b9c1079---72769599296.pdf
    • http://adabaskimerkezi.com/upload/file/13304280218.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5cda69303---27171514947.pdf
    • http://scheidenschiedam.nl/uploads//file/6460279899.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/aad8648a05fbebecd6549c5f9a2a364c/lonegomudetimuganaseriwow.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccbf016be4---zibixejejuzabozud.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2jrf4t4rm7ntl8ubi1dovge764/sugalonijamuvumi.pdf
    • http://coffee33.ru/archive/file/fululajokubelode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea06.bin
af7300b5538f496242aa62a1d27d274cff498dc6525fdfcb0246cccabe0de7b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 5520 bytes
font_01_sfnt_off0000fcc9.bin
2713b8686265fe00c7497f9040845a84ba9371de34963d9a42d98cf3c2f78596		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 11012 bytes

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