Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e93b010855e388…

MALICIOUS

PDF

80.5 KB Created: 2021-08-02 10:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a958e3a5ccc977cba9cc0e5a4e433b3 SHA-1: 05f0d94251303bbd12544b86bce4f0990ee0c83d SHA-256: 94e93b010855e38814e5abca3df14155d62a22204b284520dacb867eb9f08e6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=similar+triangles+worksheet+kuta PDF link annotation
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/uri7e49a3hhrffd3b0koar7b85/guritoxitagezegulozofuli.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/74692383265.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/81426125231.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25758adc3---kesimeleluwogove.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02492ac93---74932333045.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/jukasiwikox.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/1405o85u8t2apmej9m5blp3lo8/80873274984.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/sapijududopamasex.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/jidifafuladejavijumulaxa.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8taljcoma63d96ngckr2bj8a1c/nobuvobi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f108181a38---22866039835.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/sorilukopoxureto.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3a8090b1---58546207067.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/doven.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/10538e389c32fe607b05a2f1def563e7/xomujenur.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/141445e644f8f2ec3463b13e620f8d39/kuzebitalisibijaj.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/g5q0a7psuokidl92j7c2qbon0r/51026860688.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/gozogowo.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/dulavepodu.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/71681306571.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/rigenib.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a468b26ee12---pizazobabulu.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/30902642557.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16216819677606.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929dc118936---62240528902.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_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 15616 bytes
SHA-256: bf6ce2ca7847f0db0ec2df126c75733c2c90c1be2c577d376be93283bb74f927
font_01_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEA 10908 bytes
SHA-256: a1014ece102973e448c501a1510bee3da5e8d7b2963a07dc87a20c144838c7f6

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