Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a1a410e7bb7f9c…

MALICIOUS

PDF

87.9 KB Created: 2021-09-09 01:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a93befb46d0f03e16f7cedda80f3bfb5 SHA-1: 15792a69c50fefedf19b56abc35bc5cff4162013 SHA-256: 40a1a410e7bb7f9c5139cbe8a988cfeb26b4309bb3b4afb56fdcaa0959f485e3
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 CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://rhondachem.com/d/files/94947075869.pdf In PDF document text
    • http://askort.pl/Upload/file/xikojodikojolufoxixozi.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kapizav.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161355386bd6e0---60139481488.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/ruvipi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138a31fd6775---80791542945.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/fuwotitinonugetowegelod.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161321447d2c01---58792263673.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/70648666242.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/95879704681.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/jorusugak.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38919424243.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/rabaxumadasilinurosat.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/s0apohmfm2avo0r81qfl1ndnjq/7478622526.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3ed3cb21---75627365915.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/64493630024.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///18440243627.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161302aca93de8---manofikepapo.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1900738003613483e5716b5.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/mopozenizujewozukese.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/buxapologusasofavajafi.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/26118403690.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0afdedaf618d2d3e046fd58effd83922/13033395167.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/gebuberotozarofuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=enola+holmes+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_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 10456 bytes
SHA-256: fb28d216472e41ea5e01fc12162a4b5388b365b47585a5cea7b032e0b75a6a2b
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 17824 bytes
SHA-256: 39e57b5e37149c4faff1c54b11718abd3839ee7aad366072e8aa05ceb2d71705
font_02_sfnt_off00013a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1