Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85ab39b26cad300…

MALICIOUS

PDF

147.5 KB Created: 2021-06-28 17:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d6fbbff12dcdb0ebeb82040e5b07337 SHA-1: e1f95793103bc5fdff8b8f56465192012548465c SHA-256: e85ab39b26cad3007e9a29b6f76bdf5ddea631852c848f3533fc6af647fb658a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://arniestribu.com/campannas/file/wedovivexilijipenojevev.pdf
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/jotuwiwek.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/768ca8da73ba1421f69996c1351994c4/32939179695.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160856d2b992c2---40473482090.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0b9ccad07c074ac23ca826c5548c4602/82923523802.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/25202323693.pdf
    • http://idealhca.com/admin/images/file/33730371468.pdf
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/rilafoledeke.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff723533bb---5221232091.pdf
    • http://tamker.hu/userfiles/file/gumiromoxoxidivixabazaj.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4fe496f32---bufiwevil.pdf
    • http://czytamzezrozumieniem.pl/userfiles/file/lebebolexejam.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bebd2cd7de---39344392601.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608775c965bf7---nobavumixo.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/55468e24c08a80f7a32fab7e4fbeb616/vopokazetenuwe.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ab9906e6888e6881e6563d9f02c995f7/91621586735.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777c4d70e0a---zigeladota.pdf
    • http://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/jeritebefomazofi.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cdbe9bab2---51556205712.pdf
    • https://i3mit.com/shopadmin/upload/files/10106975731.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b148d74739b---73170200634.pdf
    • http://sl-light.ru/design/img/upload/file/wusew.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0ca04867ef108a95bf8a90f3a00fd298/90795388400.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bx36+bus+map
    • 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_off0001df90.bin
a40b104f3871f898f7b34cc03c0528dc519258023db8d8186d7a9b288191ba62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF90 10456 bytes
font_01_sfnt_off0001f725.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F725 16792 bytes
font_02_sfnt_off00020f37.bin
b77d65938d5116c4b464b15c21cf49c3e9b9f6533a996359eb4a2870d2c2b860		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20F37 18720 bytes

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