Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef7b81cbe4634cc…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 20:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09dfc4c5ca4807ceaf9ee1ab4b924c69 SHA-1: c77a36fbb5297fa221abb2d2744aa94c058d490b SHA-256: aef7b81cbe4634cc76bbdce67dc491d163fe47500b6befc5d98f477d666a7519
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7ab9f5a6---8405490804.pdf In PDF document text
    • http://www.contectrade.hu/fckfiles/file/tofazujufoxawefiz.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/jevudux.pdfIn PDF document text
    • http://receptlap.hu/files/suvuvuzatogogarukulimuz.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/kuwebudufajovejux.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/75073718106.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/62677874521.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/detomopuditavuwiweguk.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/95724967861.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/45195349142.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/jovisulokofas.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/gotepifobapalumifiziwexex.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/nomagevasamibifuvewed.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/subakosotarivaxabowadaxas.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/nozamojinazimekulenelek.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/xibiras.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/dusazanidazorupewifo.pdfIn PDF document text
    • https://maturana.cl/upload/file/faliwo.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613525397b5ed---pojokumejidiponiwina.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/47550337373.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7400de2a---63322243021.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1af69ddbac248a454413313e8c1ddd4a/35677607008.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/pilonobikifoborapononimow.pdfIn PDF document text
    • http://cl-pub.com/files/files/tilalopimojezilobofajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=streaming+my+hero+academia+season+2PDF 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_off0000c10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10E 19896 bytes
SHA-256: 3d22e9fdcbafd8eb6e959c9c763fe050405cab86476fec9b6d229a3fff0a6fea
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 11080 bytes
SHA-256: ac95c3be4ecaf0d26724745272109dbb1e52dd7040dcf53f9a4ed11b1c5b8fb2

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