Malicious PDF — malware analysis report

Static analysis result for SHA-256 931b68800c5ad5d3…

MALICIOUS

PDF

92.7 KB Created: 2021-10-12 02:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 10d6f416507d1d3251e8947339a74566 SHA-1: a3c78440cc764f749871587ffcfb82e6a6fdf789 SHA-256: 931b68800c5ad5d369b98809bb2a32688aa46aee644356378924bef1c919ebb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm pointing to compromised upload storage, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript further supports malicious intent, likely to redirect users to malicious sites or exploit vulnerabilities. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=beautiful+what+kind+of+adjective PDF link annotation
    • http://h04ydivan.ru/userfiles/file/dovuporaw.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/2297176461.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/molunaluxipas.pdfIn PDF document text
    • http://synphabase.ch/upload/file/gikujeluzedumapujal.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616314276804d---kewikiwasofevila.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/fejagapegalokoronenakab.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b47e554f2c106ed69e54294ea0071f16/judineworijuwozobimis.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/ruluv.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30077190705.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/84395271649.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/kmkcf4jqiehds1ku21lsucsfl0/fusewopomolalelepi.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/lofuwuvuwipuwekulovexu.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/rogerejobenedatepolifev.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/71147058333.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16164aaf35590d---97134941014.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///48034836987.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/wogofojalekefurepumi.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/12295073381.pdfIn PDF document text
    • http://licausi.it/userfiles/files/25812627592.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137c7c14ab64---74078894635.pdfIn PDF document text
    • http://fitviewer.com/files/file/20988368548.pdfIn PDF document text
    • https://online-wums.com/files/files/fupolewejigonisomu.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/jokefi.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109280132581980.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/rulesoraxadubevino.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615abfee83d85---26361333727.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_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 20448 bytes
SHA-256: 769bf2e90dbe97ba56b333085fe79822700f206a5dc3490372345a08e7931896
font_01_sfnt_off00013378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8F 10832 bytes
SHA-256: cf7fbee6146482343e8c144a3ede82b964079abb1e72f39287324d4c04f1fe50