Malicious PDF — malware analysis report

Static analysis result for SHA-256 234979a1d66952bb…

MALICIOUS

PDF

71.8 KB Created: 2021-07-29 21:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: da884b02c7f4e7ead2910f85afe75166 SHA-1: 4ea971f429ab463d57561efc710c68b65f9968cb SHA-256: 234979a1d66952bb1f161bd8d620f70a8fa95f5bacb9d7b15a6c2d024dd13f37
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters in one URL further support a campaign aimed at directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 5

  • 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
  • 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=lean+on+song+download+mp3+pawan+singh PDF link annotation
    • https://amatnieks.com/pictures/image/16918163648.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/873c75a421c613361b3ab5be6deda2b3/tokewedijakuwamitud.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/88390630630.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/ropumanem.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf124f3bc---37312917977.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/sipokomot.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5140cbc71---xelevek.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/jujin.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c5719cf1---fonabed.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/43832208881.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d635ac5f0---99181892030.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/595b20653a4e11bc4fc17122a19b601f/lidibemofijagazawosobep.pdfIn PDF document text
    • https://ikima.fr/uploads/file/10807459192.pdfIn PDF document text
    • https://buyafranchise.org/files/files/13281501727.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4e53ae64b---64004569398.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/45uad9ldcb4r0mesnpes2jkrso/gageleguno.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/aa06dd2804a042a3f7d005f6759fdd83/laratoluzogasurikonatijeb.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/36849583214.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/pinapufolademi.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/46921163879.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8ce561760---zeradosaxoji.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 17840 bytes
SHA-256: 58608a805c5e22cb36c34913498ca370fb20dd39e16413931358bd5d80a18f8c
font_01_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 17944 bytes
SHA-256: a236a60673f45a70b83f4273f73405c931f7f14ee21b1ce7e20659ee034d4487

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