Malicious PDF — malware analysis report

Static analysis result for SHA-256 67397531dc120672…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 19:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f611f9c61ba8ca18b3bbeab13385f88 SHA-1: 09ad8037cc14184ec9a9dbe14c3dde5d1c3a03bf SHA-256: 67397531dc12067267fe5b537d6653a7644e57cb1ee61a793073833251b68f7c
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 disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

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 https://omegaplus.bg/uploads/pages/files/govimamugaf.pdf In PDF document text
    • http://daegyung.kr/userfiles/file/20210909193853.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/tovujo.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/34876143033.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/tisizo.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/37023631121.pdfIn PDF document text
    • https://iword.de/userfiles/file/43115019775.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/kunizakudibuzug.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/40786268875.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/50679327037.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/41353115871.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/gejilaxarizizu.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/12350263111.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/tobalujunifavurabu.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/pipepimogudiko.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed0dc09fe0---vixuvoxaxexalenosudusu.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/4633492615.pdfIn PDF document text
    • https://e-midas.ro/files/file/majeregewakovenezeg.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/6941890796.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/38600301704.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/74415986968.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/78397255237.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4792bf435ea8b814cdea7710500d3802/13006046558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=wear+os+install+apkPDF 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_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 10332 bytes
SHA-256: f892d797e5949d4ee5eb38eef9d30a08787c9d4016ff8482058a41da29240163
font_01_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 18380 bytes
SHA-256: 6072a2b776702a2748fc8cee6a9d7db9bb2c7bcd19fcac01c099d4e4b9f825aa
font_02_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1