Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c6b5290e4f9937…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 09:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 158cd2e8b977568815f5f48081337550 SHA-1: 58683bd6db2df7d0cb6c456920ceffe69ab2db8c SHA-256: 47c6b5290e4f993743c5fc83ddcfc8de26d32f97f5f3e46e0089f7a657e295e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to phishing sites or malware downloaders, leveraging the 'law essay structure' UTM term to potentially lure victims interested in academic content. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://infrive.ru/uplcv?utm_term=law+essay+structure PDF link annotation
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd104950cbe---gisufetuxolawag.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8a72b0362411331861f95f199605b61/vogefekijesozodujesap.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/31126631049.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/72978015846.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ecqo2u6aas3uu8gnbel7dircv2/xifijowevafepupovab.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/90986015654.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ueopqduo73umq6ipcmnb7rj14b/danadumusogaxed.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c0739eb4e8d---2543490003.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/796a77e1867caa8e1983b1db5d61c626/33538350578.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5dk4eab3a28fvh5qjhc1ukoq4r/82382336666.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/c775850fcd23c1aa0cea7de48a6e453a/66728919894.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/18b649ce4ca3fc5ef1aa3908f698c44f/79190135071.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3c44f6af9a7998b5298ab6d332204052/jenukapawat.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/mebemureg.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8dg26v8qbqtldp7lv2c0dotqrp/94267009.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b418775f8a5---lenewek.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcb8aa79e---49846517705.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/f274d24a64bf9d64900fa9ddd2d453d5/reted.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/32887697484.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b25293dd85bbc8bbeefac4f94a1e8cba/36195735223.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/67438384623.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_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 10120 bytes
SHA-256: 57e4e9d8957d43883a463905ff9e3f523cba0b59ffe3561adf4d5b3e8f40a811
font_01_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 16864 bytes
SHA-256: d1368490cb4522b4305aa3f0be97ef7dbf40f1df5dd3dacd04e4199eb6bfbf2f
font_02_sfnt_off00012d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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