Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4684d9c167ec2ba…

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 15:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d2caf8ece27c48780258e8f4915db2e7 SHA-1: 738913d38dc00588f2509556d5eece674f50e38a SHA-256: e4684d9c167ec2ba0bf85c5a5fb712586f4452704ec39f4375190c178728b76d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external PDF files hosted on various websites, many of which appear to be compromised WordPress installations or disposable hosting. These links suggest the PDF acts as a link farm, likely directing users to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hhfrvo0172c7eps12jtt979ab8/76337079731.pdf In PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b3d1d944f6aebdd8c3bcef7c9d05d583/83190106007.pdfIn PDF document text
    • http://devveb.net/userfiles/file/51391296252.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/pevofuwinofozonejate.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b9dd384b---67965387125.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/90734847442.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/numalirorewozoja.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8a99ad002641d80cd261bf4d6f7aa6c4/nolafemiwopopitijub.pdfIn PDF document text
    • https://alutat.com/data/file/87273203693.pdfIn PDF document text
    • https://wita.lt/images/files/20246319913.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/97291927197.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612354d8d1e80---78366234700.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5f97fc6092980b1e2d74a5e0ae577af5/juwisixegu.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/70538418819.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/rewowepokemulaja.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/xanilekivoleripof.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/kobufisatuxogolaj.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/fovuxisaxazesiwevupof.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/41718698699.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/fazakaxabexoguwipevixol.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083112f6fb9b---83679163288.pdfIn PDF document text
    • http://japhina.com/upload/file/vutami.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c71bd727b23---89048717190.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/durifidakimefapun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=soyuz+a+universal+spacecraft+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_off0000c1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E0 11028 bytes
SHA-256: 6307dde0e1d613134d012af752513bf7fb02c521ff7fbf62f6e27723173781e9
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 17024 bytes
SHA-256: ef5241c65fdcc212b7466dc60ead1da424d6f73a41abfd05ec1dfcf3dd22b016
font_02_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1