Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a10a44f5a1e49b…

MALICIOUS

PDF

119.7 KB Created: 2021-06-28 13:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fdb67f5d52fb9a2fc056221449761ad SHA-1: 83ab900d6b10365a2167bca7839eddefd2673687 SHA-256: c7a10a44f5a1e49bfcadf2fb4b24821d6514fe9533c3c50c0eafc6be99ab3f3c
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple distinct hosts, some of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the final malicious destination. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/zitafagilidamizaxekupu.pdf
    • https://alakharia.com/public_html/userfiles/file/76636016447.pdf
    • https://cottonweb.net/userfiles/file/43285404283.pdf
    • https://oklogistic.lv/upload/file/37744214432.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mt72ssr2ri45te294ps9hiagn8/fomoniresodujemejaza.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50b8f3abc---72250403374.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/xofekaz.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaf6f46915---90621270785.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/t6vcjhes66o0tteiiofdb6uvgj/xedibepala.pdf
    • http://sacoorhealth.pt/site/upload/file/81664673322.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/83318431799.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/27102422380.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/f912faa2a21445af76e1cfea88b01d3a/radufut.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6fc8200ad1d8ffa010b80aac355dd2ad/xudopoka.pdf
    • http://asckhn.com/acskhn/userfiles/file/sewubutesar.pdf
    • https://globalmediaminds.com/uploads/files/95837539864.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071994e3702d---vusubogunomesezidapafu.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/81192598273.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca65cbb221---sarojigelulomakazibofiko.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c030c1195346d230819aa583324dc172/jarukasafixidupoxuxoluze.pdf
    • https://ascinfratech.com/clientprojects/trading/file/84457375167.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=international+journal+of+social+economics+submission
    • 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_off00016b23.bin
bc3a6965b7dfbe84b253a9579a39f76e30e317eaf9a076072fc58785edabc390
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B23 20772 bytes
font_01_sfnt_off0001a062.bin
0ceaa37245dba9ff6b841c92ae8559cd2adddd1e3163faf1c4281e6eb625d15e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A062 10820 bytes
font_02_sfnt_off0001b952.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B952 16792 bytes