Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8121064e698827…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 06:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2de301bb657c7d37e6eaeedb1b876fc SHA-1: a7f3f484bacd337ed1e2efadc3a3cca017386ed9 SHA-256: cb8121064e6988279517ad063545ece602c8717436c66f395b25edc20a961ea1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack designed to trick users into running commands, likely to download a second-stage payload. The document body is unreadable, but the heuristics suggest the file is part of a link farm pointing to compromised WordPress sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://infrive.ru/uplcv?utm_term=how+do+you+copy+and+paste+from+a+pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091e158ad312---weziruribabedasutewuv.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/lunopexowubijarepativ.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ad2b29b0a77fc4a978dc603ea0fe188a/67878664677.pdf
    • http://radissonhoteltraining.com/userfiles/file/8726148555.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f119b3bd7ecf7b8f58a00e56274fee65/53420594551.pdf
    • http://www.odnpoznan.pl/fotki/file/file/73247159097.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/dvoq3tjs3ope0uqacpvlfdv5j5/jetowiluxani.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c5fbcf6a---welitefekodudizokitowebo.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/osg5ggi7m0c8oov5vpqt0k8e5m/zimuzuxepivufuwobipurep.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/21c97bf70cac38ac7019c209b48ea3f9/juxaf.pdf
    • http://greece-ex.com/images/blog//file/17940647167.pdf
    • http://africa-emergence2019.com/userfiles/file/vorujojewilutaworavuda.pdf
    • http://dlt-nkp.com/fileupload//file/vapeta.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/a8h8abf57ajcma73unnegp555g/gilokowu.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/k2btm3uoicttaao0tfsljdf4eg/94683960786.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/bb09ab23e483645a5b0d96296baf1bde/79647318468.pdf
    • http://short-story.ru/upload/file/50400865689.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3674f23b94adf4444bbc9ef463200dfe/76366598873.pdf
    • http://sparkpro.lv/content/file/sonofamafofawitipe.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2137c4f981---zizedumomax.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/02c257e4433948de8f55d9f704dd7d7a/7667722073.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609252e7c19a3---36484601594.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_off0000f0ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 16792 bytes
font_01_sfnt_off000108dc.bin
edac6e1cc34fb701dbee5f1de3e60dbf3556d2ac992b764ea76ccfdb4e96df5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 17800 bytes
font_02_sfnt_off00013717.bin
7669f969a8040bece1e05a7a4cad4b2f5f216843de4657edf9130c81086831d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13717 10936 bytes