Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e65bc5212760e71…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 04:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b700f50c701d0c0e6b49624c5ed2f7d5 SHA-1: cffecdd54d9db523f834e70a8c1610535a92cf06 SHA-256: 0e65bc5212760e7127b13c5b5283e5300a24589dd595e17b46704c9d28cd7d2c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=no+sim+card+found+android PDF link annotation
    • http://richardchong.com/userfiles/files/terobakezo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161383825ec6ff---88545545635.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/87413303403.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/durofuwomaketivigevedev.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/pejopopimiketifaminora.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161404922857b8---movujogikujajerupib.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/198a80a3df433395858ec808a36ad572/36805458283.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/60902993593.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/goporanaxeriletatuv.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/10882440486.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16145910960598---74283359331.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/52959448787.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/dosivunidodofoborudedew.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/kokixoti.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/disenimevokadajaborezut.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/5c8f95317b0ca9805cd5699c6f7c8957/66220000421.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/tigaguvuxelo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7bc83694---27071172701.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/kumiwazepit.pdfIn PDF document text
    • http://coca-colalife.eu/userfiles/file/24548260278.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/rikasijenesokirolas.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/sodakukirat.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631234839.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/dubuxiwazugiw.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/41608943218.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5C 16072 bytes
SHA-256: ceb3018e498bd94698cb8de44f9556283ebfb6c4541ebf675cf1e1bf338f0b95
font_02_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 10440 bytes
SHA-256: 0f59ce0309797a319c9a022a72b794559b22aaf9049aaa397088247f8424d457

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