Malicious PDF — malware analysis report

Static analysis result for SHA-256 668e1478a417e060…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 05:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4773e89a52e2425cefffe7e6ed0332ba SHA-1: 3d525621d9d6f40693e3547acc753391742c5f76 SHA-256: 668e1478a417e06039f7a012b1f37815bb75d7bd46a60ee1543ef582ac0bc4a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the use of link farms on potentially compromised CMS uploads are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://coretry.ru/uplcv?utm_term=how+to+get+deleted+messages+on+instagram+back PDF link annotation
    • http://nfrostov.ru/upload/files/93885881164.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075454b9ab9f---pojabalubugise.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49a2acd5b---5977762301.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/nkrbcc58qra8rut186a38kkt7a/jivatuvojosireb.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/9866485769.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/livitevuvetofemak.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/vlrkcl2e19u3m71pe9e0dahpp2/vitavenebebakakurumigu.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/8dd0cc30fd61cad09d790c6f4152cc5f/75521037312.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/wibex.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/65208603450.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/4b215f310d94796dedc8593c6b3ebd46/kazesiwixow.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/94757240732.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/kic97e6u2j2gk3mp39lv8ei9hh/detut.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/84dea1f36adf59deb11fd76e3c45b4cd/jakeliv.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a215f0f015---rusajuxawufudoxunazedo.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a981f55419---64943468420.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/43463636238.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/69omtlsc37m3edtdheluijlh9l/46430287755.pdfIn PDF document text
    • http://envigest.cz/upload/file/50990240295.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/bixodikepupekotugefifezum.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8393f2b17---wipegab.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/48779556019.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/67126277293.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/935387e9907c83711e2e2a7b530512f8/47123638359.pdfIn PDF document text
    • 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_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 17860 bytes
SHA-256: 29f103c6cd0347df0ad3fd11feddb27a501710b5514de55e7044b70c2bf937a3
font_01_sfnt_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001231b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231B 11020 bytes
SHA-256: 5cf14fa41f2cb77897298e38671d973a2fa5f476008d93949b2f3ae4b3747eb8

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