Malicious PDF — malware analysis report

Static analysis result for SHA-256 967488d3cb46adfd…

MALICIOUS

PDF

105.8 KB Created: 2021-06-26 05:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e66684dd6f44adcbf517355fae873038 SHA-1: 975bbc5d775501ff259165cc2ab9c86f41288630 SHA-256: 967488d3cb46adfd412d045451b9cd44c6313fd39f6d51b6fa173fc0d62ed2e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://twinslock.com/ckfinder/userfiles/files/relowaxerutetudafan.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/72bbec818852f9dfca0e21fcc7126c31/pomaresezudepiwixidob.pdf
    • http://pusancard.com/userData/board/file/23066906092.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/946nli59nahnbr4dc1jv04gkgo/69780730049.pdf
    • https://betalinktech.com/blmedia/file/63288387770.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/fceedf4db5b15ebf08c859cc7de62aea/wosebexumitizaduxofoxab.pdf
    • http://3dtechgroup.com/uploads/image/files/xuzumuwoxidamamo.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/4rnp3n9ipubq6kp0rahk3ercac/22127030147.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/bb7e287a6531dc09627ac5fd91e105cc/pewujefukin.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5da5380c77c032278df8e352424afe3b/gusuto.pdf
    • http://grafichesirio.com/userfiles/files/jaragekiwetarazep.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/l40i1jl6iafgsqnbff09s2jnpv/xabevutituvilojak.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809c30c93bd---zonojomovaxutakama.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b197f96d08c---7085067631.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1b4e27bcb71fc5e98f73ce8a84ce0a0e/55986735907.pdf
    • http://gps-tw.com/CKEdit/upload/files/fugak.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a30d54f6a---sokaz.pdf
    • http://luingpyrex.cz/foto/Image/file/momaxefolijeb.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ff73080b0---gevasizekepo.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d237e1c10---73384442846.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607db90a0a8b6---47875008149.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/559nqeoighvlbg7u8ei474v3l0/47937845040.pdf
    • https://immobilgold.com/file/874642862.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=7+on+7+passing+league+plays
    • 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_off000134f7.bin
4c94f4a76cb8147422fa33a1297cdd25d6f6f1b1de17377552f1e4363fcd1dc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F7 10396 bytes
font_01_sfnt_off00014ca5.bin
843a73e8d878f44bd47158781e9214d174865f1ceeb0ca8afcae2ace6408888c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA5 20592 bytes
font_02_sfnt_off0001822a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1822A 16792 bytes