Malicious PDF — malware analysis report

Static analysis result for SHA-256 9590f7999914af5d…

MALICIOUS

PDF

99.8 KB Created: 2021-09-04 03:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eca04fc40dbef47bbb21f500336e79cc SHA-1: 34d6363febff2acc8952fad46ad0b6331b9c4f82 SHA-256: 9590f7999914af5d4e46fe60032d11d3078a7e2b188a620b8aa0b876cd35501f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a phishing or scam attempt designed to redirect users to malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=ctet+question+paper+2+2018+pdf+download PDF link annotation
    • http://www.motionmantra.com/userfiles/files/12974810319.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/77bbdc7acdd1459a720d83b281093a4e/15566224168.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/fegizamojenekiletagoxepuz.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/fixolenisekonarug.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/12utircrq7iqrbgk5egvo3vith/69362536840.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/6840756380.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/motijamojifesewuviletuken.pdfIn PDF document text
    • https://vestol.bg/files/file/xisiwabubuvurose.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/968904695.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210708_024ADF0E79A04310.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09390e33c---weduxudejotisiwodutuguxi.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/pasemomup.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/futusigijo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaaa1ee2c---semebiditirom.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210521140732.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801b03d6e99---gudepomitese.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099c26ae67fa---lonerexemamonubuso.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/fosarosizotexasawar.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/24469938360.pdfIn PDF document text
    • http://llux.vn/uploads/files/16460644844.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/73543998342.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/petefugizegopusikopinigox.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_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 20440 bytes
SHA-256: 4d1437092d3e8070a6201cd37dce821ede20d9ac72ef9ecc109746cc89aba285
font_01_sfnt_off00014e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16647 11356 bytes
SHA-256: d05f85821a13db8c23395ff192d250c7eb1669bfcb92a096d8933b09cf2a0753

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