Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe8c52fb31dac7c…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 05:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a49aa2c5fc97bdb95fcecea3f34e216 SHA-1: d3c2308e34a0235d19afb3026900c94fedfcd9fa SHA-256: bbe8c52fb31dac7c70665c4e8abc45b70880e374f9cb2f966b422ca945a87da7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=fifa+2020+ppsspp+android+offline+800mb
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f243144c4---9611280920.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614572e496155---winozu.pdf
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/79069877824.pdf
    • http://stavclearing.ru/upload/files/nugapexepis.pdf
    • http://fine-trading-knotwork.de/uploads/media/kowemimevogojov.pdf
    • https://shirbandifelt.com/userfiles/file/70175176416.pdf
    • http://studiotrusso.it/userfiles/files/fatosuranose.pdf
    • http://tw-sincere.com/upfiles/editor/files/zorojawefokisoruzugi.pdf
    • http://klm-co.ru/foto/ck/files/natofepedizorezotimuw.pdf
    • http://poledance-chrudim.cz/files/file/67742162238.pdf
    • https://fullprotec.com/ckfinder/userfiles/files/dazojisuloja.pdf
    • http://futureinfashion.com/ckfinder/userfiles/files/kemapagokonigapavibof.pdf
    • http://fitviewer.biz/files/file/92197113387.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140420ea886d---nudezimuzowek.pdf
    • http://studiobonvino.com/userfiles/files/95165940856.pdf
    • http://smolninskayahotel.com/userfiles/file/pijejotidubo.pdf
    • http://millecolori.it/images/file/13489652459.pdf
    • http://jlicentral.com/images/authors/file/15407199602.pdf
    • http://furniture83.com/upload/files/96113014304.pdf
    • http://ferramentabelleggia.it/public/file/68998061245.pdf
    • http://potentialdesign.cn/userfiles/file/1630681166.pdf
    • http://quanhoangtsi.com/upload/quangtri/files/87909997673.pdf
    • http://geometracosentino.com/userfiles/files/vadabesosuxogibuxoge.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_off0000c693.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 16792 bytes
font_01_sfnt_off0000deaa.bin
5230b1e4a5a28bdbe062067958d457e33d069844abef0ff831a83c2a497bb0f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 11128 bytes
font_02_sfnt_off0000f85a.bin
6bcb055d6e9b2c1edfe471b038b98dd1228fb83331490bc067364014f4185716		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 19608 bytes

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