Malicious PDF — malware analysis report

Static analysis result for SHA-256 02d0b440277d7cdd…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 14:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c8c177e694d10e7fa0d516d63c31e5b SHA-1: 512d0d369a63f411a535edd4edc39bb00cdeff8a SHA-256: 02d0b440277d7cdd0527a79a46ca16136e0d8a57466b0625e56b223e96a029ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://hometextiles-consultant.com/ckfinder/userfiles/files/regokuxumi.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/e0c2ucjdeie5veojerehti6uaa/rizigusowake.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//3279289064.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cdeb6fb7d---vuxojavegilikubi.pdfIn PDF document text
    • http://naviway.su/upload/files/litivinufozuminarumususa.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798f6decdb1---29698559190.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/paseliv.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/87323068781.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wevujodilof.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/11315435513.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/goniwovosetulafomezibefa.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fd879e9f---4104510787.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/97243334882.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/tijudejegomuxak.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00b5664b48---kowogexovov.pdfIn PDF document text
    • http://talleresjpg.es/img/file/6573420346.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/6708404313.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/85275524353.pdfIn PDF document text
    • https://o-dance.com/upload/files/vabet.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/89710058056.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/resufavuva.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/t9ictkkqrbugqj0e492m7qeg9f/27798906843.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a1987cb77---mowowerelilujobowoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tense+formula+pdfPDF link annotation
    • 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_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 10532 bytes
SHA-256: f98640ae85aa8fb0a6fd134e96b8c78aeb34f98c137a3cb1a7443dc4d894b752
font_01_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 18220 bytes
SHA-256: bca7b2b59931f8e801810f7c781aa0159261f2593c305df78987d05fa868c8bd
font_02_sfnt_off000126a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1