Malicious PDF — malware analysis report

Static analysis result for SHA-256 b112bd6c5f1e1782…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 17:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a08ea27f4df7637b82778668a5dbbbe7 SHA-1: 77b2077f7300749b1014d6da7137398d8e7228dc SHA-256: b112bd6c5f1e1782b9907febd04e4240a8885e550bfe7602a850939413290989
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=acsm+file+to+pdf+mac PDF link annotation
    • http://spbmedax.ru/sites/default/files/uploads/xotudobapitono.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/wozelevifazigepire.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/bufavapererakibibuxixim.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/31238794036.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/20228465153.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/80569224583.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/83850998969.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/53415202948.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/fijefazugitovededobe.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3496e76e6---22364942512.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/74696379945.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/43935069554.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12749192520.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/zuriro.pdfIn PDF document text
    • https://pokereshop.cz/data/file/6678154423.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/nikojalasobekalopa.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/22789976292.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/zevutiluwalurinab.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/82791981436.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b9509b21dcddd5375932341740621752/dakarakalovigafofiw.pdfIn PDF document text
    • https://krusomying.com/data/file/17182294766.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/75469498807.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/11002479685.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/28258972099.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136db8b58348---48722413469.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_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 10556 bytes
SHA-256: 82bca33261c05e5115daf1b1361b2e4d6a373a5f7eaf205a1a522ec304c345e4
font_01_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 17836 bytes
SHA-256: ca02f5c95a7c1c5ae07b1fadc3cefcf12bfb5c42a3960b4aa3fad4b83e3d97a9
font_02_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1