Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffe41a58b811c1e…

MALICIOUS

PDF

86.1 KB Created: 2021-07-13 19:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8711b968e3345525b122644d5167d95d SHA-1: baa5622600a99094accd14b73245888dd05e790b SHA-256: 8ffe41a58b811c1e51172f12cc439587aa6c22a5ed9d3939457ffefbbf54ec3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=foal+kicking+in+the+womb PDF link annotation
    • https://rimsball.com/ckfinder/userfiles/files/24212074118.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bc4132d01604bff11c6a5d2c61c18f13/4163803266.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pvlhdpcgshfi245kchq73fbto3/22047678361.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2a30291a11087044e50e12540a738e48/gatufudugojad.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/92871452812.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/nizujuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed01a01ec2---jotaripu.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c5d1dfe63---23398901817.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/96140876519.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/38233003049.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160862621d61a6---75872519443.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0de754ce58---kaxeropo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfd62ee6b4---vefewanavudokasenavipo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0fdeaa9f44741cf51827ecea71e11684/nenug.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/19403072292.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfab805e44---jibigorezikumogutimulumav.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/6354212506.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/rirezuk.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/wegogozapeguxesakefikave.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/bisakirisavokusif.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094c606a45c4---90405590718.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/94c3c283cc226d19c70fca058d871fdb/89092010088.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/nokepudulirutokixuva.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_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 16336 bytes
SHA-256: 82b3218a50257302771e0bdf312d4c03ab0d9fd4c59a7e1e5e17f8a4e3fa7a40
font_01_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 10704 bytes
SHA-256: a1e25db0e31e0770b9d7beb0bcaf232f8cab3e904e65bbbedc5966c33a7a8bd9
font_02_sfnt_off00013316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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