Malicious PDF — malware analysis report

Static analysis result for SHA-256 865c406da72611ce…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 22:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ca4b11e2bf21e380b6847ee3bfc466e SHA-1: 89215f95a6431b5d45a29899a9a18ebffb8eff4e SHA-256: 865c406da72611ceac1050d422e168747e5b464a6b1f93e20ef89c4c8c822854
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms with UTM parameters, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=exit+west+book+pdf PDF link annotation
    • http://cioccolatogallucci.it/userfiles/file/zokoxiwaw.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/74110332129.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cmormlhd4p8brcb0ql0tk2q18q/pivaluniti.pdfIn PDF document text
    • http://belovosushi.ru/files/95273796700.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428a37e01b6---furiraruzulowofuxanokoji.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/24071921202.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/47664117530.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf8a471056---lovizutidojutuxuvef.pdfIn PDF document text
    • http://mestan.by/images/file/rotitixikisopabu.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/51091159017.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210912_6501D456C6AF39DE.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7562d3f7b---37585738295.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109071655027575.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c44a107c3276347fdfd8915231d54a00/82824291796.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138a76055f23---26063802996.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/30080987961.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/91055789865.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/xarek.pdfIn PDF document text
    • https://trieurodata.ro/images/file/xidipafuwimipetomiladem.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/taxusasajosejajemaxenu.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/88928174909.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/sotowofedigenovadiwaru.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/durinolafoledijadiluguwe.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/lejuxug.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/10674355317.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_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 17076 bytes
SHA-256: 7401267eecadfb1263d520b46057931c070773e2acffe9881541e0d811ddaadf
font_01_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12354 10480 bytes
SHA-256: 2a92691008dadeb05a4c8ab8aaf5cdd0c77b2efd51f09cc602b82e2b9844f27b