Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a3a3947a465e17…

MALICIOUS

PDF

73.6 KB Created: 2021-09-18 00:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6350a47a6e0ff9356d507c6f2ca39cd1 SHA-1: 6a1583fe038fd981699d9a2ed8882aa52e42f568 SHA-256: a3a3a3947a465e17883972770161d22d29471863de3893510b7085fbe12fc8a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript and link farm suggest an attempt to redirect users to malicious sites or download further payloads, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=rgb+live+wallpaper PDF link annotation
    • http://elektrostroy.kz/ckfinder/userfiles/files/vifogibegiwuratebek.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/zilofosebozokuvam.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/84216780799.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138131938215---wejuguf.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/gunosogikamosu.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/nabaserasiziboneromije.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/57372501005.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/80403037304.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/roduviwawaxulazunipa.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/xugijenanapuwasu.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/51098159523.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc9a7c40f---48578033463.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/17287458846.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/cead8bb1bde80121977a1961cf322252/43034337768.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/18238388395.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/30696819230.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/93203677265.pdfIn PDF document text
    • http://szcftz.com/upload/pelonubuvurugirume.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/vumepinofodobobakaxumij.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/1068483676.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/kanaluwejogaxuriwi.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/95568036998.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/nufokovaxab.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61343f561e43e.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/botixalenanifaxuzebujite.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_off0000bf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8B 16460 bytes
SHA-256: 01b9b1fce008ce4d0f197497a391b102cc16282c19e6d5913fdd1c945c5b11de
font_01_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 10272 bytes
SHA-256: 5e72f231c574be62a1af32cfc692393eb7ea40293ab6b05630e588113ef782cd
font_02_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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