Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5992a54251f1ce…

MALICIOUS

PDF

95.7 KB Created: 2021-09-08 19:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c0fdc8b7a416fd5ad39919dae80f3b0 SHA-1: c77089563ef8fec4ded15e62f4b2b68dc160af1e SHA-256: 6f5992a54251f1ce3dc59177192dd136d273bea91e52896395c5c88ab5c3c6a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://edu-soft.ru/site/htmlimages/file/lewaluludupotitawiropune.pdf In PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/31190660011.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/lutuporutipikojukopovegub.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/29704435226.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/gejuvatepazise.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2299292edcc9feaa737e5d44473ab6d7/969505128.pdfIn PDF document text
    • http://cartopack.be/Images/file/pelinivodovabexuvanu.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/japabusotuwibezaluxi.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/569180852.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/73525666283.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/puvabupitolir.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/jejeparatatumoxiru.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/dusatuzi.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/xokamiliwemewixiwudebewi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/95164460110.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/xogumesibiweket.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/sudomisarimavo.pdfIn PDF document text
    • http://boldogelet.hu/media/ponajekozixidukaxivitop.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/kejolepirexanevax.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/jet35qca6ip2g26bbhtadfnjta/lenuguxarafexomimagitinu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161378ad7d7003---futozip.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/91127590179.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/tirazazilejiromog.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/81747658646.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/nujutesejelifezuzifigo.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/musuzunedojozumobuwiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dissolved+oxygen+calculation+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_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 11080 bytes
SHA-256: 8925930ae8cd617ec1d3b909b96bc9df39868f3679f1939bb714e454782bb716
font_01_sfnt_off0001281a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281A 18708 bytes
SHA-256: a5d8e9c2492ee08b29c475d646d1026a082e7ee381b2d6f4f1f198e8dbe1e5d1
font_02_sfnt_off00015892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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