Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c4291ca3bee8d4…

MALICIOUS

PDF

69.4 KB Created: 2021-09-11 19:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e0d3fc5ed8863790171afbac4558c95 SHA-1: c899898c8ae55bf6bf9be7cd5b35289419c2738f SHA-256: 18c4291ca3bee8d4647d0aba5abd00f5737217e9e12374da0b0cf632705e4cb7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure due to its small size and image-only content, designed to trick users into clicking embedded links. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect to phishing sites. Although no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest an intent to lead the user to a malicious external resource.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://sportingclubalbinia.eu/userfiles/files/55836123070.pdf In PDF document text
    • http://360global.ca/userfiles/file/15152707385.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/xaxarita.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/nufuxodativenobufiv.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/97717768093.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/lopojutikokugitele.pdfIn PDF document text
    • https://penzion-palice.cz/content/13564383246.pdfIn PDF document text
    • http://tavio.su/files/file/81133224464.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161374e7e18b97---84100921494.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/5844746525.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a33c089fcb---17454434107.pdfIn PDF document text
    • http://matras-devison.com/upload/file/gabimadufew.pdfIn PDF document text
    • http://synphabase.ch/upload/file/6201739363.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393caa67fee---xojuwaderoselid.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/61257584659.pdfIn PDF document text
    • http://furniture83.com/upload/files/lenaxadavujakuvejusobudo.pdfIn PDF document text
    • http://cityfate.com/files/files/nesumuberifamunodeto.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/62163233174.pdfIn PDF document text
    • http://thevalleytrader.com/files/sowetanutemetowigisala.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/dedixixavajubaj.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/xopas.pdfIn PDF document text
    • https://fivetc.net/uploads/files/15380389595.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/jobefaduko.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/monisabo.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/89277425291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=human+evolution+clicker+mod+apkPDF 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_off0000b408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 14056 bytes
SHA-256: a0ec175e3ce46f3ffae5d9887ccb93c5d29df95903c8851746e64cc568fdc01e
font_01_sfnt_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 10756 bytes
SHA-256: 9470a337273a5aa9716aff7b8d3ce73a636a49021018f43f2caa3dba0fc9138a
font_02_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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