Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d43777cd399692d…

MALICIOUS

PDF

70.6 KB Created: 2021-06-27 06:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0aacc8ea8950d39a732b29aaaaa6826 SHA-1: 841d7bef7c16f8248c666584d62f5dbb81821d1b SHA-256: 9d43777cd399692d214edca70bad45f7240dd2e39f0e0e6421b7952e528cf46e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various compromised websites, many of which host other PDFs. This structure suggests the file is designed to act as a link farm, likely to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=two+floor+small+house PDF link annotation
    • https://publicbridge.pl/userfiles/file/71375610556.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210626064730_jwdagr.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/ripalal.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070850f0b530---datikodifodemawoditive.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9578689fa1447dc0c54f7fbbdd2a5951/zudotunujivebojuvadovef.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65a8ec852---27984822602.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/99941459886.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608629085a281---52449197920.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/71610672893.pdfIn PDF document text
    • http://askort.pl/Upload/file/lajonigufozoxividoluz.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/850e0e5cfc300541bd919cef561465df/63958959602.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/jafokegovabesurekoneje.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e81c0c8d---23042803628.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/41558628697.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/68518643400.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbaa550ea---7160561602.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/efb8a826718f30d5dfb9eab00d9e6e54/povefeludokipiji.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/30110194910.pdfIn PDF document text
    • https://tl-systems.hu/files/files/49559193855.pdfIn PDF document text
    • http://inse.us/uploads/images//files/puloxawiwikorisitev.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cf18f67fedb2daf312b5050379c0dc3f/53086056243.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_off0000b66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66B 14944 bytes
SHA-256: 99678b6876e41d41d90468baa8d71958b3eb35d19d8c230145d5aae8e179f392
font_01_sfnt_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 10336 bytes
SHA-256: f0efbd173b1e3a3f0b70c844c1dd24ff06af53951740a0bf6011141c1141e7bf
font_02_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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