Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb76519d6b41477…

MALICIOUS

PDF

85.8 KB Created: 2021-09-22 21:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f5af2a4e0efa0dd98068efc76ef9839 SHA-1: 11f17245eb4441e1656262c83374bf9a04dedf5a SHA-256: acb76519d6b414771a589a2670677a7381248c54d41658548ab89c3dbdd5d666
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous external URIs and links to potentially compromised websites, suggesting it's designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=android+1+games+mod
    • http://seoulsquare.com/userfiles/file/rejobazesam.pdf
    • http://netichikawaya.com/userfiles/file/negutorat.pdf
    • http://tlxzkj.com/uploads/file/131833175144.pdf
    • https://cobrawire.com/userfiles/files/ritigidanusaxasum.pdf
    • https://mangonebike.com/uploads/file/nuxuwidirivebo.pdf
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/62453499306.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161352aa435026---biwaw.pdf
    • http://studiodabo.eu/userfiles/files/tasatiraje.pdf
    • http://www.horakgolf.cz/ckfinder/userfiles/files/salibofeberiwanuledulawaj.pdf
    • https://ndmoyun.com/calisma2/files/uploads/84572256792.pdf
    • https://k85shj16h-561lt.com/contents/files/lotas.pdf
    • http://jhdljz.com/userfiles/file/1631451188.pdf
    • http://kgmda.com/upload/files/vojilovepixazu.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0e90c54b8ace9a31986e48cf22881693/javowuvesepagak.pdf
    • https://5703n1n6999-6a55.com/contents/files/28937503925.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161456409a9e26---54946100718.pdf
    • http://metallpress.info/files/gapenimibuludusevam.pdf
    • https://sassanoproperties.com/FCKeditor/file/nexutukopijaku.pdf
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/27614341640.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491076c8e63---20533729287.pdf
    • http://musicpark-live.com/userfiles/file/11690415308.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/efk4op4kaeloi1dlq7cud074jb/fuzolobewupesusumif.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_off0000eeb3.bin
ebd15d1d40ba3c4ad23ab47e650d542808380654ff6f978279f535e6f373a85a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 16752 bytes
font_01_sfnt_off000119f5.bin
7cc9954488f4eb3ef204e3fd9d801f5d6027a9f1a3a3d3ad86304a121d7eb99e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 10480 bytes
font_02_sfnt_off00013193.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13193 16792 bytes

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