Malicious PDF — malware analysis report

Static analysis result for SHA-256 2860fffd9f4661f3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 05:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dec35a24346d0a30114c74387caa7183 SHA-1: 79b294344c0739f8942cabffeeb4f13de4925bf2 SHA-256: 2860fffd9f4661f36a4cec7e5f8cc7fa9051fbf58311b1e4d1bf06511d44a4ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of external links and the nature of the hosting suggest the PDF's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=tommy+fury+live+stream
    • https://nmg.lv/img/uploads/files/86413296237.pdf
    • http://greenvisioninternational.gm/userfiles/file/72039701798.pdf
    • http://co-wemart.com/careeruserfiles/file/gozipet.pdf
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/zobixoduwen.pdf
    • http://keralabiblesociety.com/fck_uploads/file/xokisowusiliva.pdf
    • https://10glazsikeyrosa.ru/file/69282536709.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f350aa3a2---94824994029.pdf
    • http://sumosushingrill.com/uploads/files/4288212850.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534d82df3a---91802280918.pdf
    • https://mannoorpally.com/uploads/file/jozabapaxesujenikeni.pdf
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/tafiwazexisowase.pdf
    • http://toanthinh.vn/webroot/img/files/nurorimekulojumigel.pdf
    • http://eluvial.com/sites/all/sites/eluvial.com/files/gibavipifizegumifedukoge.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393dae10fbf---6662553911.pdf
    • http://luatkhangthai.vn/upload/fck/file/302282758.pdf
    • http://safetruck.gr/images/file/forimedebamabumonogajose.pdf
    • https://ozsersogutma.com/upload/files/39293994248.pdf
    • http://stepasidemedical.ie/images/uploads/file/rilizotedidezepavovulore.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaa26c23e4---dopavadufebok.pdf
    • https://muacash.com/webroot/img/files/jitusefi.pdf
    • http://dietaltop.com/userfiles/files/67355172446.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe943668a6---23269124776.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_off0000da40.bin
a4a8cefb82a0779006994c51ca0b92e0828573f458865df2ce68be3d08a8e1bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 17476 bytes
font_01_sfnt_off0001079c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 16792 bytes
font_02_sfnt_off00011fb3.bin
5b8752f5b2f25ea26eb459e4363b7df73a46d47039daf1c0c74225f8a239af90
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 10516 bytes