Malicious PDF — malware analysis report

Static analysis result for SHA-256 415c897ffb10c51a…

MALICIOUS

PDF

83.4 KB Created: 2021-06-27 20:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34550192e44b06829488cf308265776a SHA-1: 6aa51b8ceb898feda73068bd302eea7abeaa2531 SHA-256: 415c897ffb10c51a99848447b9573b88820a91726d798922d9108667cc8bd989
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate the document functions as a link farm, directing users to download files from compromised WordPress upload directories. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e028c8337f---12228208099.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i7v8crkglpi410ehp0m74gnqc5/2329782115.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d753436d0d8---74531756316.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a246791ed84---jegirivigarirakemuporo.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831be57b34---33973946849.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608301d1b06d0---dubepababebanawa.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091821068e13---sudegolaturexomo.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608768aa77418---lapipexidoxazudiku.pdf
    • https://motacademy.it/file/59711196226.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/3e60ea8379f00b842e5ca320d0c0e81e/38357523611.pdf
    • http://tebsc.com/clients/84181/File/dejesidarisatoxa.pdf
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/72875968774.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c8875272c7054a751fed16fec4701c90/60388365403.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/44820ef9ce1933d907a01963ca1f3af3/29798242979.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/50337332456.pdf
    • http://acril.ru/ufiles/files/2705974770.pdf
    • https://deepankarbasu.com/FCKeditor/file/10821488120.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/lobepisokufemefezevavela.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96573ac60e---gulifonorogudisebuxigoz.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/397cddb1d3c51ab4f0addb92a2123a6a/63724643453.pdf
    • http://lideparts.com/userfiles/file/1623743388.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+converter+pdf+to+doc
    • 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_off0000e4e7.bin
a022841f63d0827c8d67ee9aec352a48637dee7763e195d9aff5260e12560757
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 10508 bytes
font_01_sfnt_off0000fcff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 16792 bytes
font_02_sfnt_off00011511.bin
ff96b9964f6d709b1b76e27f956216c254eef1759935381660059caacbcee7c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11511 16760 bytes