Malicious PDF — malware analysis report

Static analysis result for SHA-256 92774ec22f55aa64…

MALICIOUS

PDF

85.1 KB Created: 2021-07-02 14:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c5a4c809f0bb1f179f151aea1038dbb SHA-1: 5527b7490777f8df2fc006017d539ef3534d2a84 SHA-256: 92774ec22f55aa64083640a2feef71a0d64f9bae6370ed8caf0e8d21966d46dc
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/sqija5lb3fl1tp689atfajjv8e/93176994194.pdf
    • http://copy2d.com/ftp/image/file/janoparivozo.pdf
    • http://axiomestates.com/userfiles/file/widojetowodifu.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4416ce99f4---68913601796.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/6811f2e3460453784ab3d90061f03052/vedad.pdf
    • http://dlmberatung.ch/userfiles/files/20658285250.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd77e3881cf---tebunadusirapega.pdf
    • http://winso.tw/userfiles/file/tutonozegamesoze.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/lrnneufbka58629pulrd7uhb4i/66738512333.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099b4621489a---wimawitipepirosodaf.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c3592006057ccd7b899d11256341dc9c/17085396862.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64e1e046cf---xewefewipawevegimakogu.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/e510heb0tat1m44qfk9v123f3r/53246633114.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cb23a7587---29329336812.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da66d48e262726e1b8f0050bff8034b1/41615139284.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/da7e4bf948cb9fda9ed31953956c97fb/65293612661.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160810cc8db16c---zowujabunofegobawo.pdf
    • http://xn--om2b25zm6igqb.com/ckupload/files/85807494023.pdf
    • http://www.pattyn360.com/upload/forum/files/45054587719.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210618_231722_2863.pdf
    • http://umrllc.com/userfiles/files/60032806230.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e1f24618---renubadewika.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae93b04e762---76316966968.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcb96150e5---ruferesidibiju.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=christ+be+magnified+original+key
    • 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_off0000e6b1.bin
474ebfcde4f78b6359460c6a3e7b8562bbd5b3d11e5318c204b0789ce6a18e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 11180 bytes
font_01_sfnt_off0001007c.bin
defc04e0323e47c9cd838672737c41f6bc74447656262c66d80d7495ce05169a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 17632 bytes
font_02_sfnt_off00012ef9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF9 16792 bytes

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