Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb729fd9d0fe589…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 04:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 26c6d0821691f123ae36065f97773d0e SHA-1: ad53f3a51d591a28a02e9cd39bc119ff87016995 SHA-256: 5bb729fd9d0fe58992baa7c4f7f9faa20485e0bb2eecf7000f503de2899708e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=sample+response+to+resignation+letter PDF link annotation
    • http://jkbprivateiti.com/userfiles/file/mumikago.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/rinozulirarod.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/jamopamumu.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/lefofizaluvapapanejeb.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/fijajuposexajijoxunulavop.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9ff4f24d2f6abdd2cb83f26d408be2e1/wuranuviwi.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/lasinesaxegivobab.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210902214716_xrcx20.pdfIn PDF document text
    • https://maymac.info/userfiles/file/41596384887.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/kobekenameterajewe.pdfIn PDF document text
    • https://izr.fr/files/xepazatimamafid.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/vomapulovoluwadiki.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/21416419376.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161448428c57e7---22338942507.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/vunokagiziralam.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/karekiwovusaro.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/71676933657.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/poxawefawuvaz.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/nujodadekiralafubijib.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/56040086122.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/mofododixogijotimekora.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/solirakudege.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161426dec35412---xumiweralebow.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/42960854791.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/33762627589.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_off0000c525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC525 16796 bytes
SHA-256: f237ac995449d2545619f906983222acf0987c4bb8632dab167ac9f6ab859c35
font_01_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 10668 bytes
SHA-256: 51802a5976c673e1eaf02b56fe2d8d0818f552f863563deb02506f149eeff2bb
font_02_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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