Malicious PDF — malware analysis report

Static analysis result for SHA-256 1834188d3755e216…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 22:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 578120c5a753d5daffddf07ca9c8abfe SHA-1: 8edb8f13ec4a59fb1ec3fac4c236b424a507eb9e SHA-256: 1834188d3755e21667beccff0fa8b45057038360e89e60662767242084b8b383
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. This indicates an attempt to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://hbleg.com/admin/userfiles/files/xajixuwisumigomasiji.pdf In PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/nvkbi5l1l5n1064gtjkbv78ubr/99323721668.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/latodasiginiki.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/56c48c2fe5154547f5dadcc2bffffa90/sonorogofirakexurosat.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/8565201832.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/degavas.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67131647736.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3d9bf891975db5256aa5a9fbbec826b7/87044056292.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/78f48431c674ded8b7ba1e6a173b1c02/68680832173.pdfIn PDF document text
    • http://vswet.ru/f/vajipapotun.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/5a281fe1a62df3d8256f6a5089593d8e/27217378752.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/mobegawalobafesevuz.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/aaf2069e6b29191abe2a717ca43fc1e2/pagoga.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/4115230846.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/galug.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8e7008976---waxisixugozo.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/49676797846.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/defaweluduximan.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/mujivalunitusax.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a1bb5a5891e6d7678d6ee0ac6f212bba/78784913968.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/55dc577a7c6b8939202d2b4040aaa3ac/49884857628.pdfIn PDF document text
    • http://a-pluset.com/userfiles/20042792403.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c27e0b3c77a---fakidajutesasigav.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/wegaminaxa.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/sosomigidilasukiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cabinets+to+go+catalog+pdfPDF 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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 17404 bytes
SHA-256: 3faa2e320fb1253c8bd1e6bdbd69137529369e9ed937b43376b895fa02b9e4e6
font_01_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 10864 bytes
SHA-256: f9d5f34ac88ae33fb19a7cb90269d21b3dc8249186e641493fba92a24528458b
font_02_sfnt_off00011efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1