Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b6e1737294124b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 10:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7e01fc9a9e6e9a0046b606ea73a9227 SHA-1: 64a081f2d6b406a40c5d3a229e84127d25e3bee7 SHA-256: a1b6e1737294124bab71f6ea4e05062c525265ae39d491bae6675ae5d0518c53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a large number of external URIs, many pointing to compromised or disposable domains, suggesting it is part of a phishing or spam campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=teonanacatl+libro+pdf
    • https://rajatotogroup2.com/contents//files/wabezigunitivizogaba.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e466fca584cfc554cbc8217839568a87/17118501700.pdf
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/lulodadu.pdf
    • http://lenosada.sk/editor_uploads/files/fudedasiwetelitosawirife.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607515c866617---faruxixofibuxulo.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/2asj6urbr7v8j02grjjastf2p3/38754965032.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/d77c38d6da487ff4c0f1dba74cbc9346/99383861788.pdf
    • http://cka-shiba.com/ckfinder/userfiles/files/juxowegutirosadekosufopi.pdf
    • http://wang023spa.com/userfiles/202108file/2021080110092970554.pdf
    • https://kingwrapcarspa.com/upload/files/xolavewolarubexe.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/gogumagapej.pdf
    • http://bkht.vn/userfiles/file/78968899406.pdf
    • https://carlojans.com/cms/file/89928855812.pdf
    • http://devveb.net/userfiles/file/14996208931.pdf
    • https://santa.sg/images/users/00000000/files/midevagaxaziliduvitutota.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7cfaae5a---rapedobobazalu.pdf
    • http://jhdjt.com/images/upload/File/96251838300.pdf
    • http://nkmate.com/FileData/ckfinder/files/20210726_BB5AE568005F56E6.pdf
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/58364217000.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072b59bc319d---95516769956.pdf
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/89282565585.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3e1cdb1301ecb384dcfbff02f5294b64/57593798107.pdf
    • http://mmbc.cz/_data/user_files/file/93917377555.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fb7ac7850---janoga.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_off0000cc1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 16792 bytes
font_01_sfnt_off0000e436.bin
8c8eb3ad2bb12e4ec4951acaaf095588a7f256de669d15b3c8e0ee5bea33c83e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 10548 bytes
font_02_sfnt_off0000fc1e.bin
92cde35cf3b4cf4b445a19e0ac8f55ac54e170ca45cf951dd746925fb591f3c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 18244 bytes