Malicious PDF — malware analysis report

Static analysis result for SHA-256 db581b581b3ba24a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 10:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 347165e8c094b869edfe871aaee5a017 SHA-1: 37f2e5d2bbc3e2048efc313ce5a856194da3e873 SHA-256: db581b581b3ba24a85ff554fcfb81d4e93028c3523af80f0cc272d141fd1b7a2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick the user into believing they need a password to access an archive or attachment, likely to bypass gateway scanning. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, further support the idea that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mut-zur-veraenderung-hambuch.de/userfiles/file/15481869937.pdf In PDF document text
    • http://dyglas.com/userData/board/file/45571497277.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160def74436d0b---84699639038.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e941aea3a---66280822244.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/nuvavufezibij.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/68440947340.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/jibawixosi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7a5f4539affb75c3d03c05020b8b8f6b/92519283338.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/dajuzasixididifonewabedi.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/27829277811.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4a4e7e113d8407e9c0eb6146492098d5/25247706283.pdfIn PDF document text
    • https://inks.bg/userfiles/file/30891349961.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/danarirubamidogije.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/vawiwuporufojevu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c42ec9586173677c105358afe980d2e2/62999042610.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/10903074742.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef4f96349---fomubasugalifas.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd7c63096c---pepolasutezobepemotidufo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afad69b4e76---lefevusojufona.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9bb345c6c94cf7dda40eda672503d023/93407300843.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/giwuvugoredexegum.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/kudifevovotiwolovevusemaz.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/20379879908.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072b311c6418---zanixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=quitar+proteccion+pdf+para+copiar+textoPDF 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_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 10660 bytes
SHA-256: 413ed34711d3835f20186e4201bd79e60e614a966166e9f4c4f673c4adfe407e
font_01_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 17352 bytes
SHA-256: 0f53b8ed5abe7e3224fc2310d1691cec4542d2069974db12cda4e7bdb508f93d
font_02_sfnt_off00011cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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