Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d592be9b062e558…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 11:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6de07333bdeefe7ab0ab94dbf81500e0 SHA-1: fcc5ec3934558859763cf3258385ada7f9fd32b4 SHA-256: 3d592be9b062e55846456e8a283ab2806fac72255460060e62cb681b65a4f149
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/7f89cf54a5f5773f8f39460160ca6637/doradi.pdf
    • http://okeefesreef.com/ckfinder/userfiles/files/buduxefobomefotivarewe.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f1c5d40bb12e7d13047f67fe0fff3a0a/85745912967.pdf
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/41716894239.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c324764d894ace2b2f73bccaeea94ca7/befinigefefotojub.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/defafilepixetotiguwodal.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ocur1ucqnlff4vuvu0d7gpiumk/41349272378.pdf
    • http://aygroupmuh.com/image/files/pofetalikederefuk.pdf
    • http://yaeram.com/userData/board/file/12356830840.pdf
    • http://mosvag.ru/img/lib/file/54484680596.pdf
    • http://studioboscono.it/userfiles/files/92568836914.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/lalup.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-12/20210512145315962586.pdf
    • http://rollfactorytogo.com/uploads/files/rubolekanozininoxase.pdf
    • http://www.bufolari.com/public/immagini/file/22684433403.pdf
    • http://easyreturn.store/userfiles/file/58276494934.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/jijul.pdf
    • http://pekingtogo.com/uploads/files/lafitapafarokiritatol.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c85d8698---petebivibo.pdf
    • http://xetaihyundai.net/upload/files/zuvopafisamebajelojinomiv.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/0d68af284034d038e2f445558ddea0e8/sisonenixobumakamenib.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/11815884980.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/f9n7j1p959kt14dcnj5isblihd/26186035117.pdf
    • http://maslag.eu/userfiles/file/65761490570.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=zingiber+zerumbet+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_off0000d239.bin
1fe88689d709a2082dd0764916e6345ed3df9cc1c1231ff1c19857c1047f7001
pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 10608 bytes
font_01_sfnt_off0000e9ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 16792 bytes
font_02_sfnt_off00010211.bin
21a9e32e48569ef14ef0ffb186caf7c214cfb07c97ad8a1a5bbb429343095999
pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 21796 bytes