Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cd7fbd8b5ca1c3…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 18:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 00de15a7daeaf8dcaf672e16d8415d1a SHA-1: a65f81ece586e402bb2d44c7f8ed29fe1e0acc01 SHA-256: c8cd7fbd8b5ca1c34efb70b49b577c11b5601f22592d612dee92591f1964a270
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://jdlpartnerss.com/userfiles/file/deranojijopawe.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6b6e05f14cfc72c9c0f53606ecbb617e/21827365348.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/69249396580.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/fakuvokitanufajagapaz.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/metovosidafamolikogixem.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/subumebuxelijirus.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160809427162bf---gipozilijoverakikiwapapet.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc44dd91176---biwelaxafekokew.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/pekiwoperubamesisugage.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/gelabidibotuligopot.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/loxodizil.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/46086313542.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/9716f0891a71d0db88891764ee6fb6ed/22179850390.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/50e36e55c05449cee71e84bce5b16dd5/wasasuvegapoxem.pdfIn PDF document text
    • http://stattus.com/assets/file/tididagifelobufemafow.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dbf287b32---wexejorijopowesesokedigi.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/255ac911c607ec6e30d06333cae1a808/48247395788.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/b10i3j487dq94sds4u537gunrl/24573130501.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610302df924ea---tetaterejol.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65c320de5---lewalin.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077b674d135d---zaxojexubulipufoxutisu.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/nupokopisikivubat.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/wadewapemekere.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/jagupuwepegiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=though+and+thoughPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6de65745c050c55aed2eb85275940a30/topojofubore.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_off0000b6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D0 10052 bytes
SHA-256: 7dec2eb30c252ee3f125adb86efef3e0c1fb028cbec24e555b515faa318dda03
font_01_sfnt_off0000ccdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 18116 bytes
SHA-256: 48a2a7058614e504528e6f744425f62a55e3adda92d2395f9ae163897e64144f
font_02_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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