Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcaa707c62ba438…

MALICIOUS

PDF

85.6 KB Created: 2021-06-17 20:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 354cc3a19fca8b225b2f44109f860d9f SHA-1: 9800f5617dc348c4c901d619b926acf41f2803a2 SHA-256: bdcaa707c62ba4382ae35f30d602fe1b431689ae47d532d881ba651ffebbdd2d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to medical terms and application metadata, which may be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allmedicus.com/userfiles/file/92894981451.pdf In PDF document text
    • https://actorconseil.com/files/file/99199140605.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b73d2c096dc---12156877435.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/32b2af85e4e55b8ca0385a0306f23b10/1668742768.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eded4e471---50778704794.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/91306130131.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c8a8734c---5036849434.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/morutofonedavereg.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/90b8bcf654ec022f0e02cebea083f94d/zizowibow.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/8d3f5c9333c5a78c07d9e2bd8bca6319/govupomivifubitefa.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6eea5b98---vupazujazegewopagixuzaru.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/pclb5t1tbt3lsdm8e0e0rkuj8j/18418959436.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d54ab84f2bf39a4263b5b336ed7e3d6d/pazexumuwifotop.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/60457447397.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/17725616230.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/vilarufataxafunusivi.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/d4eaa8ad59a2bd57f2f39926f8c3ab3e/34153801192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=severe+peripheral+neuropathy+icd+10PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 5440 bytes
SHA-256: dac771c957223f407cea71b26011811e9a3ffe8d0aefc8cd756e3cbc75ecf97d
font_01_sfnt_off0001243f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 11028 bytes
SHA-256: 51c44e47e25f056b56e089770b18a2c5e18ff970ccc8438df2e93e32d55e74b6