Malicious PDF — malware analysis report

Static analysis result for SHA-256 04432aff0b71f7f3…

MALICIOUS

PDF

105.1 KB Created: 2021-09-08 10:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5f395df5b73eaa650b40de87e9b7381 SHA-1: bc0902fca3be71500f7d5d15d29c7ea831fc5f21 SHA-256: 04432aff0b71f7f31bf2bed801a6aaa9f0dcd40553c0e614d6a4353232a9b5bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://inwebjor.ru/uplcv?utm_term=chemical+engineering+coulson+and+richardson+3rd+volume+pdf
    • http://darienhigh69.com/clients/866565/File/31556198493.pdf
    • http://okmarin.ru/userfiles/file/82188400548.pdf
    • https://medosojewellery.com/userfiles/files/ziwesujavinetil.pdf
    • http://jatyn.cn/upfiles/202106/file/1623260512.pdf
    • http://yoron.net/up/files/temobamapasod.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/42042484289.pdf
    • http://kraemer-duennebacke.de/files/file/49437284160.pdf
    • http://ttlh.vn/storage/ckfinder/files/mibozaxapasuzegudunogi.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/gazemunanudod.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161218a0761bbd---91998895656.pdf
    • http://ztkammer.at/uploads/file/65602766861.pdf
    • http://france-ex.com/images/blog//file/29180665183.pdf
    • http://jan-fotografie.nl/upload/files/jemolini.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098194eac8ab---mefasefed.pdf
    • http://union.travel/ckfinder/userfiles/files/kuzawamejoz.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609416feddfa7---somot.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081531545763---jababidar.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/04dd2508a253dc715de5cbb6df10f811/kotipapeval.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0g466pcabai0i7siip4tjk4rpm/19491843073.pdf
    • https://tsydesign.com/userfiles/jws/files/jenugekinijite.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22b8496ec---27420482311.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_off00013219.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 16792 bytes
font_01_sfnt_off00014a2b.bin
3be6b8e3259c2ba7417647be97d3aaef8308c99697f62607686d619d2cd4651a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2B 18992 bytes
font_02_sfnt_off00017c1d.bin
d83bc1ee157d33af270a4cc9532e5f785ec8a1f25187ce88cf4ecd9fda1e0418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C1D 11336 bytes

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