Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f9c0101f84ddea…

MALICIOUS

PDF

92.5 KB Created: 2021-07-08 08:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2cfc476a565c5259719bb3110fe4d2ee SHA-1: bbe5220e6184b7f1a2cee88ba2fc180485cd4c69 SHA-256: 43f9c0101f84ddea0f2111d223bbd5f740a0a7709de8b5294f956905e41771d1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites, suggesting a multi-stage attack. The presence of multiple compromised CMS upload links further supports this. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c5148a4d3c1---2679652862.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b7c5picdo7asq8vrvm0lngl9l/gapifatovaj.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/vadugosodabifosoxudilo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8a0587ae---81599153382.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/34402287976.pdfIn PDF document text
    • http://vswet.ru/f/38310707475.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4bada2d7---buludojegesilij.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e4cfb8274759ea9dfe914e786d722e47/ketosuwefuwiferizusage.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/273c4bb47bc0b1d5141043aa4b8d52a0/pakivapapuzibamafu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fd478df96---popitusemizujar.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ffa7f108---27818453529.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88a54c8ea1---kutemolo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7281586cf9---rawikakisew.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/905502f715f075cc63a9743f626ce885/71812769923.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/bisarikuxuwofilolezuzase.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d4d57deb6---benimufevofi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n7nl5lifocpd4mpjkhdmr49oq3/vanaxubiwetarepogazegawor.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/prurpq2t2muvkdrhv0dtot1joc/juzosagagi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8af7ab4c---76754449722.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fe0d64b2---bekevunawajiruvidavene.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ed81e94cd0f1eeb414a787e49298ad2b/44694812683.pdfIn PDF document text
    • http://strandedtattoo.net/file/ladulezojum.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dh3m0luaihg9qdhul8b76o6sd5/75928930294.pdfIn PDF document text
    • https://dm288.com/slicice/file/42557342669.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/36c63660ecbe4483883d1d9c7f5c1aaa/faduvisaminitum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=list+of+objections+in+courtPDF 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_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 16788 bytes
SHA-256: 03ef41280b21c1977064f8dea47fead287af0c6d4772d8dac08c95646eedd8f8
font_01_sfnt_off00013330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13330 10448 bytes
SHA-256: d3f4b898b8c03147c0a9663e482bb7111edd6176b0a2177404ecec6c933001dc
font_02_sfnt_off00014b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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