Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3a9ca3c1cebbf5…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 00:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cebcd7de563dd021291066711753341 SHA-1: cef3a38f0be3dc6e1dbd3ced8fadddf5ea519d19 SHA-256: 5a3a9ca3c1cebbf580f9739d45d9aeb2e27f55b6bd3098f392787c403418f677
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting. These links form a link farm, a common tactic for distributing malicious content or conducting phishing. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • 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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be4d31d23cf---34584298165.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ff43ad8fe78---79810382730.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/refujenutoxuza.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b43f70c0f3---neboguvumudimokisu.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/2579019990.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/zewepilowoxotefu.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/62962657220.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/nedusajupagemudijojuj.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/kufirad.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/98284445301.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/tekizalanajesokosa.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/xuxegetebirogeziji.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/ziguwululenowojimurumero.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/adf8008cd14509eb1232c49c27d265c7/narixosoxunexowokipi.pdfIn PDF document text
    • https://bamor.org/userfiles/file/rulukipojoris.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fe2823e726af9f929011dca2722d8ebc/jinogetekujujiranafupo.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/15868350625.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/67363406447.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7437bb63---teretorolimiteriw.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bb2dcd99c---49506553795.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1frb72oobu6bl2510fr6sltfh7/velokavajaratarodukedaras.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/538573c32da86bcead694c4c5d430a8d/329935035.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7fa47db1e---vuxujosut.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/nifegofowezu.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/rojupur.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/nigokakulizefefosoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=scavenger+hunt+in+the+house+for+adultsPDF 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_off0000c342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC342 16336 bytes
SHA-256: f87588380a0e8804f0db7bf7b2580e87e09071bbf903d7dc8edfa8062f953fd6
font_01_sfnt_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 10996 bytes
SHA-256: c84a70fdee7c2f9c2df21d36f2c0042d477ba3cbfc03b8fbf97e993d0e6585c3

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