Malicious PDF — malware analysis report

Static analysis result for SHA-256 90742f788467fc07…

MALICIOUS

PDF

85.3 KB Created: 2021-08-21 05:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2fa129c58f494e96b39fd5c541769174 SHA-1: 5191eff96ee59848d0ba0d176395151822a3ca4d SHA-256: 90742f788467fc0710b338913eba80dee7c5e19543f1f0c372215435eb4a710c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to potentially harmful content via these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=minecraft+sex+modpack+download PDF link annotation
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/29785624229.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096a0a72fa90---71452710215.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/63501238998.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0abf03044755ca81f8e2dfb5a03d322c/12755414357.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4c5b8df2d---mumutepek.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/divofo.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/66078854233.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/fezisijidukaxikus.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/n7jv5k5mbf41mm7d3us5jqcbpj/32310062984.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/vasuxonewujarovufuxa.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/gazososagufo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609836e6a056e---pabuko.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/58361710762.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/66372587394.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a06783673---mekufilumum.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6a921a5b38f04c083e24b76fe20872b5/wixixejijipotat.pdfIn PDF document text
    • https://coatielectronica.com/files/fomefakujerutel.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/pesow.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4183a80937---97959570714.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0eit00pkqllh8cg79q77ch1mi3/fekorolel.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/853a413a3294f849f27ad3f01b722aa3/13521791542.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/zajomelazimotonob.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d93199d7---zararamig.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/bgu44efv873cefkin5612lu1i6/paxobekilexonaw.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_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 11056 bytes
SHA-256: eedd9a0bf6f012370ebd0577195a9dd020824d804f6cf92d5ec201f7e9727bd2
font_01_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 22588 bytes
SHA-256: 5c090962ce3be4f264a8fda573b238f7589bbddac1ef0d6b0299ce0226b0bf25