Malicious PDF — malware analysis report

Static analysis result for SHA-256 3368178cea224f93…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 04:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad6d995733fcd705db71af1ec8c2a7d6 SHA-1: 3d34d85e5ff00e779ac90cc583981316b08c71ab SHA-256: 3368178cea224f933ef6c773031a4b8675a8fb050a6852b63e4691aeb4030e53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=brain+anatomy+worksheet+answer+key PDF link annotation
    • http://auburn-companies.com/userfiles/files/43028808578.pdfIn PDF document text
    • http://furniture83.com/upload/files/7259015998.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/zalazebijalerev.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/13168194799.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/fevabipivurivab.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/gugeduvaduxe.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/netamakajufulodiza.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092257e4be41---34617590432.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294192d9a79---povolavuzi.pdfIn PDF document text
    • http://parfumland.sk/upl/toturepuxafejev.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/78813797492.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/pazazovagatogod.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/mixotud.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/momudolenabaf.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/95626937428.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210528060223.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7553f4a2---99468356990.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3fed048bff814f27f7737d8713477e1a/1892687014.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/nasinarifudijosivuwow.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a238d495e39748916f489abf050cb70b/86341840272.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/16316161812.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/defoniwatazukerifa.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/xonak.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/mulate.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/4e6368dca97780dab9d0338a9f3a797b/94614197274.pdfIn PDF document text
    • 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_off0000c76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 10672 bytes
SHA-256: 060fa9042a2fd3d923836b2307e96ac8176af1babf5b012796eed9301e4294c5
font_01_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 16552 bytes
SHA-256: e9cb8a2a30450140c9cd8e538ff3cf119dc6c39d93a1fa5499ff8d509a9bdf97
font_02_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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