Malicious PDF — malware analysis report

Static analysis result for SHA-256 8915ef221460b288…

MALICIOUS

PDF

109.3 KB Created: 2021-07-24 00:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48f5d12b990ac2a02fd684cc66647645 SHA-1: be971a1fff5cba1f53e13fe99547e716e3c0a3f6 SHA-256: 8915ef221460b28863a47462d1a7850da9f34e5e5be299e3655f424b1db9c1bf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/db25db96aed6acb2dffea43054e14a6f/rewesafofepozesis.pdf
    • https://navliecky.net/userfiles/file/noxifomexubifipuwej.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ulnm2g9ems1vi25tpb23tkh9j0/devaxagumipibe.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/b6ri4hu4nn88oq2pslf6pd18cb/metamusaduposi.pdf
    • http://cayxaotamphan.net/userfiles/image/file/vumogemavirisadisegav.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/388c4c27757dcf26728a1f50db1c0a81/33171959121.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/b41e5418448131f4f2d6285e7641f6b6/wogubekonobagipisuxojesu.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/56594788909.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/9bfa23131dd07853242fecb8d2122af5/jikusulirunijaxonavu.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/e64211dbea7d51b7db418e6dd3666531/64381463519.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b8d6dbaa3deb2946e91dc3b8aaf28d9d/23942296925.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f788c32420d6a978d4632a7d1b0dd7a1/zetojune.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc44eaaefd9---70609392127.pdf
    • http://mosjob.ru/images/file/30697854812.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c29801b0366---95918898001.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b53aa0f87---fojexisim.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/he21i877phdsrcvdhagobdgkl8/pijogedilovurajon.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c488465baf5---lutizemitefukurobof.pdf
    • https://lasanisports.com/files/58292387296.pdf
    • https://binarbaid.com/public_html/userfiles/file/13756408783.pdf
    • https://hoangnhataudio.vn/media/files/kifudidovi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ora%C3%A7%C3%B5es+coordenadas+exerc%C3%ADcios+com+gabarito+pdf+7+ano
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/61382c524ef16ea3ae05678058073764/dipowokikorosifo.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_off00013e8a.bin
ce2d4ce54724e17f7d0761e57834efe59b4f8cc18a0d642d8f96bf6f6a4179c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8A 11716 bytes
font_01_sfnt_off00015993.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15993 16792 bytes
font_02_sfnt_off000171a5.bin
b195c9924fcbb93d40cc2133c9f4bf8b38e183e4e2f81c2a1bc4e69b7bead5ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x171A5 20476 bytes