Malicious PDF — malware analysis report

Static analysis result for SHA-256 6852e6346be82acc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 06:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1daa8be616e36a38dc1cbd9cb32c32ed SHA-1: 1473fa18ec795a474336593ca2eea03f30048cb0 SHA-256: 6852e6346be82acc8538de342de5dff15dd46c4112f8e90eb009db145f0889ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, suggesting an attempt to hide its true malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=dictionary+english+to+persian
    • https://cuatudongnhatrang.com/uploads/files/mebevatidisemenirore.pdf
    • http://oishisushigd.com/uploads/files/30696716948.pdf
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/51879801280.pdf
    • http://animalscipublisher.com/files/upfiles/file/93434572893.pdf
    • http://baovethanglongmb.com/upload/files/nenagojutujodofazadi.pdf
    • http://bkmarine.net/ckfinder/userfiles/files/1630990608.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/29008126286.pdf
    • http://globalsublimation.net/uploadfile/files/daburogozedosagezogelib.pdf
    • http://studiocariola.com/userfiles/files/40262125792.pdf
    • http://wisdomtours.net/upload/file/lexunananoxotutagogade.pdf
    • http://gesgo.de/userfiles/file/foxolutokisufefidom.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb3aae876c---wivozepivufikitesiruj.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614177f0e9d90---tawifegir.pdf
    • https://ou-ravda.com/ckfinder/userfiles/files/vanejopefikejiwaxumapak.pdf
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/18782172093.pdf
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/79321673722.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/24456133426.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613661be0beb2---42208754144.pdf
    • https://minhvuongthuphap.com/upload/ck/files/2385703286.pdf
    • http://inggeo.eu/userfiles/files/82473955686.pdf
    • http://alisawedding.com/upload/users/files/31256795753.pdf
    • https://istanajp.com/contents/files/sefexalowoj.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d942.bin
1c639375c8ccad4a2706579bd9d73d5e1d2a0a00596236a22483b4a45ec5ddb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 18340 bytes
font_01_sfnt_off0001087a.bin
8a846d02a16dbbe5d984fc37b7255012a01371e990d20ef922523b36467a708c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 10768 bytes
font_02_sfnt_off00012142.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 16792 bytes

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