Malicious PDF — malware analysis report

Static analysis result for SHA-256 79962a28c8218b46…

MALICIOUS

PDF

88.9 KB Created: 2021-08-05 20:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6d06de6d753656f76ffe26a73e3371b1 SHA-1: d39a8cbc755537508ad453c6a9c44dfde48440e6 SHA-256: 79962a28c8218b46bb0f8655aa187354ce1db5a7e068cde4fb8ab406fb54cf2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites and are designed as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or malware payload. The embedded JavaScript is likely responsible for executing the malicious payload or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607035e04f3e0---lajedipamolonexipiwumafa.pdf In PDF document text
    • https://reniuved.it/file/39897032884.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/mixevepovuza.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/24987740811.pdfIn PDF document text
    • https://ismart99.net/upload/files/18981815978.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af4f3c0f0b---kupazadigalabujalikifofud.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/79103279638.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/4321516953.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893e5b4ef7d---96377453518.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738baeee25d---37746775255.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/23491883690.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adb48b1ea58---73900190750.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/tokasexapizimixu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2b68adf182f6f7dada7473ed55e3efe7/jaxaredojixesamolofuwa.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160daff60e5c72---weril.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843922d0c94---raludaxiwekize.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43c8cb4526---zuxirixorivaxorufa.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/kugowu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a3245527ec0---maluz.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/85976084300.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/37598369246.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/26044012677.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/be47a489c4860aa3dfa7098f7dbbb4a8/53983170647.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/maduxasevusife.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/19562604502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=is+the+cares+act+extended+for+unemploymentPDF 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_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 11060 bytes
SHA-256: 3ae37ff1de73fd4142e9b40682083a2648675344e17fa4af60c7f9e979fd0c24
font_01_sfnt_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 17588 bytes
SHA-256: f2bd68cdeb2b5a3935c65909d87d28bf11a1182a986784671ed3b70df4bfe2f3

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