Malicious PDF — malware analysis report

Static analysis result for SHA-256 0541d94fe0220e3f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 12:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64398036bbb6b4b365fed627bdf7ebe9 SHA-1: 5a3eeb3554da294d56b2851407cabfc56e510aba SHA-256: 0541d94fe0220e3fe0fcbac87b6a2883e5b0e551dd8cbfa33865a56a08260103
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The high number of external URLs, many hosted on compromised CMS platforms or disposable domains, strongly indicates a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=when+is+bnha+season+5+dub+coming+out
    • http://rent-lease-no1.com/userfiles/file/20210919044208.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/puzixiza.pdf
    • http://dentish.ru/ckfinder/userfiles/files/18460311822.pdf
    • http://photopuzzle.net/userData/board/file/jisobafa.pdf
    • http://sys-svinding.dk/userfiles/file/xubetewukumi.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614484343cb43---60213205442.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/2719311488.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/822bdf266d389e269a73c5c58eb8f516/zaxatafipi.pdf
    • https://path.mn/userfiles/files/14925076229.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/ripazixagu.pdf
    • https://emmaushuis.org/pages/fobiposarejer.pdf
    • http://papianiarch.it/userfiles/files/nadazejitupetanivovuni.pdf
    • https://eliteprotectiveservices.net/ckfinder/userfiles/files/22869944324.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/hfktqa091nlesid8p1n0h6ras2/fuberuxukabutekazipitamov.pdf
    • http://financesnadno.cz/upload/file/doruzewagudanosalefitadex.pdf
    • http://pwmtqatar.net/userfiles/file/72954593286.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/21405549936.pdf
    • http://noahmission.org/dataroom/file/xuzapunakafig.pdf
    • http://ghefootmassage.com/fckeditor_userfiles/file/33421222606.pdf
    • https://bloomeng.com/uploads/ledivazikavurasozofimoxi.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_off0000aba0.bin
23668ace8c022ce8091816efefe17c14c5c3bd4ad3b90571e5231ce5942c23c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABA0 18012 bytes
font_01_sfnt_off0000d9fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 16792 bytes
font_02_sfnt_off0000f213.bin
1aae50603a1dcda0651390ba6deab4383fc1cdc2e09cd02e5a6dc3d453dc49de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 11040 bytes

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