Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc2d7be03fdce82…

MALICIOUS

PDF

79.0 KB Created: 2021-10-12 08:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cfe3a17d2986210aadffbb738f6fad1c SHA-1: 5742cc6d299eeb4cded6cd455a0ed3ae9f1e0f84 SHA-256: 2bc2d7be03fdce824e677bb1d71d32bfa7c293725d6df940e0dd5570e4cb73a0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings and numerous unknown URLs are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://deleeuwputten.nl/site/data/ws/files/gokugukobopotigowe.pdf In PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/24371932682.pdfIn PDF document text
    • http://space-edge.com/upload/files/kevujelo.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/vubibivibigunogi.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/15934015501.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/gamakiwenol.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/74697631088.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/76673167740.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/3853623165.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/83917200178.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/75364670807.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/13718303.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151f7a5bb784---76803340400.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161360f52af9fb---zukasofuke.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/63294575803.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/76768831522.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e5de773d3588d81927a3b627bf51244c/43808163691.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/foditoviwukabupidifawi.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109291447136780.pdfIn PDF document text
    • http://biomehl.com/images/content/files/moxokemita.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/83266096394.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/896FEnmJZlk/uplcv?utm_term=collision+theory+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_off0000d2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 10580 bytes
SHA-256: b5843ca9efabe7a165b7d51a2e0cbefacd374f407faa43539fb8475538d72fa6
font_01_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 16752 bytes
SHA-256: b2538b03fec2e5916155bbe7dcba83b890fddf7b6d91168a0476d23ac857f6b8
font_02_sfnt_off000116af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1