Malicious PDF — malware analysis report

Static analysis result for SHA-256 311db65b4e5b1254…

MALICIOUS

PDF

87.9 KB Created: 2021-07-17 23:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e9c808fcc232759c5c0c26eb501fe4a SHA-1: b81b2c1e64107f2ebf578cf358993f9d4f40e8d5 SHA-256: 311db65b4e5b1254bba9ddbf186a9e25412f00802812176e461c275eb0e866f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users to phishing sites. While no scripts were directly extracted, the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e335b8323f---6761240587.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/426f1c4366cbc0aee5d5c4e0969720f0/tinikomosixefeletu.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/bukalenukimirukazol.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/46da4a024612e27e3d9006dc0bda3415/tonejuwu.pdf
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/jevij.pdf
    • http://solamsys.com/userData/board/file/13336262472.pdf
    • http://gernano.eu/gfx/userfiles/files/42097938501.pdf
    • http://thermogroup.ru/uploads/files/84294674688.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qupsccat76r6ri4sp8qd330va2/65013045910.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/1fd93d83839226533d0f6e02ff898a61/44906721516.pdf
    • http://montazerangroup.com/uploader/file/6132252338.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/11123455508.pdf
    • http://evola.it/userfiles/files/ragujanomivejafazogivut.pdf
    • http://apricomm.com/userData/board/file/74085674947.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f7098038ed76dc3e28137aa3bd2a10bd/91593169477.pdf
    • https://arerp.kr/data/file///jevul.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a24f7b7c62466eb8c792e9e25bcea2a0/51408262560.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/bd47c8f244bfccbd14d4d859132a9017/tilenopegeta.pdf
    • http://novussiteyonetimi.com/uploads/file/tibulufojifekinumadu.pdf
    • http://aexpress.lv/index/images/up/file/88268544239.pdf
    • http://www.armstrongre.com/files/files/vefuxiloruse.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf74dbadc---zavebolepiwi.pdf
    • https://kabelkyaobuv.sk/editor_uploads/files/lenirazusepam.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/971f83ef844a233daff304397ab4d1ed/27297877905.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/a5kajl4uefkb7c1g46ue2vqr17/likiwukutipebinonofatabi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=essentials+of+igneous+and+metamorphic+petrology+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_off0000f153.bin
d2fa5eae6c89680233ae61b03f68029a87315411748965198730c057522c64a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 18360 bytes
font_01_sfnt_off00011f81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 16792 bytes
font_02_sfnt_off00013798.bin
875b5af26c3b78812edd6acd25199ad725f5f531381a32f85a2e4d95642b737d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13798 11264 bytes