Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb203c5df929f46f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-05 21:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 202de81825526acf1d18b76046907d4f SHA-1: 590a1dbf1f82b02107afa3e3a18a23dd5669a3be SHA-256: fb203c5df929f46f9808dc26041187c9c3c6019cdcb8e81b9a27f7ea833493be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and links. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lead users to malicious or phishing content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d06ebe49---97317413539.pdf In PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/23761097646.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/93210773360ce848ec20f0.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/52366240366.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3e421bc62---makegog.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075325061fb7---damobupiwoduxu.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/8522221758.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083289b5a829---55794294090.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/37004c112057a3b59b8821eed3062329/pafofodimopep.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/jozoxano.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/19224060834.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/8afd661fb498f8b712334f4592a7ddcc/nepegesofegojukijasajew.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076b18cd0236---78422414145.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/89128073877.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pekos.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/zubikagebifagavodupo.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/17913795434.pdfIn PDF document text
    • http://ashioke.com/images/library/File/jewet.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/81616546949.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/fovibagisenapuzotov.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/5655674817.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/zubitewosixedapabilofur.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/buzalalatitedajup.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/26869ad741fa0f5122631c58efa93125/50414860279.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/18702498019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=positivismo+sintesi+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_off0000b6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D3 10420 bytes
SHA-256: b3f188f9afec6a40b58a02bd90e353c94b17278802ece97b2b9259ad9fcb733c
font_01_sfnt_off0000ce77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 14792 bytes
SHA-256: e0e0899edac3c5bf73dbd71f29ec4c7b6deaf6cd7da03f6c4fe961f3626d16a8