Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb54d99e232acf3b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-23 01:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50a7dcd964f1770e87a4fdf23238739a SHA-1: 5c90ace3eb132323159cf15afdf7b688a2c8c3cb SHA-256: fb54d99e232acf3b63542e4397e66fa1b825c2cea927c633623603e6446292cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=apk+need+for+speed+most+wanted
    • https://thehideawayresortpattaya.com/userfiles/files/kozusifafiwafiga.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/39366598694.pdf
    • https://akproauto.net/nbloom/fckuploads/file/32021226690.pdf
    • https://iva-vietnam.com/userfiles/file/tegataxopivoxuvemefu.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba8149b5ab---zowosagenegivug.pdf
    • https://promenade-perpignan.com/userfiles/file/98196846778.pdf
    • https://support-trevianum.nl/userfiles/files/lurojit.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210904_003050.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e3d5bfb79b2775f0a21dcc6907fa56d8/mubama.pdf
    • https://ingatlanfelugyelet.hu/uploads/file/fibifesuzufimuzopat.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89390119b---negulinobixuxomupakelub.pdf
    • http://barahi.com/assets/userfiles/files/raligedajak.pdf
    • http://swhos.com/upload/files/tujemuge.pdf
    • https://skillmapmagazine.com/ckfinder/userfiles/files/90985675011.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161347e126537a---kopukenesikavo.pdf
    • http://newshop.jp/archive/file/notagebufinotowawaluvadox.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ptm6l52lr22n3mt8pq87t7kj1/zewalipebuletaxupina.pdf
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/82494204388.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/575732621.pdf
    • http://koreaseowon.com/ckupload/files/95829592315.pdf
    • http://learnersdigest.org/userfiles/file/sotetokadodab.pdf
    • http://sterenstein.ru/userfiles/file/rofazisa.pdf
    • https://12shio1.com/contents/files/45087461024.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_off0000b3b2.bin
43dcd1da021374ff199b1d4d886f257d4fda87042b83e38e287120f207adf884
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B2 15252 bytes
font_01_sfnt_off0000da93.bin
64aa2c124b439f975c56c09078fb5ab6b7e2f106bf87f255acf93330f9d8e215
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 10680 bytes
font_02_sfnt_off0000f335.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 16792 bytes