Malicious PDF — malware analysis report

Static analysis result for SHA-256 a463f912e8105d5b…

MALICIOUS

PDF

85.5 KB Created: 2021-07-10 07:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed16fb95649940b5fce5185cc5e5f843 SHA-1: 87beadfd6a7044bd86de196ac18006bc80bdd8db SHA-256: a463f912e8105d5b507eb28e41b0fadd1a4c54cb5d8d11edf4da3387549259eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting the PDF itself or redirecting to other locations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070dc42018ce---bisat.pdf
    • https://soechi.id/userfiles/file/36197826650.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/9oasu1bnib7cqt2ml9j69mhk2d/mejimosuges.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a197c16fcd938d7e4d38af6fd8df34df/pevonoxuje.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/fdeaac1c14ee716b3e715484886056f1/21066410393.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf1ed55d8---jomimekem.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf17c385e6---lotipet.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b4c08334---53521229612.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/48712bbcb161fe84ac7821ec86f35c05/mijazotosowozaj.pdf
    • http://autodilykanka.cz/cmsimple/images/file/kubojapikeve.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab893575122---guvix.pdf
    • https://wegofa.com/userfiles/file/xevumodobumixaxosizeropez.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868260e9a20---25989002527.pdf
    • http://staresecurity.com/userfiles/file/mevurixigisupam.pdf
    • https://perfecthospital.org/FCKeditor/file/zitovesikuzuwizetaz.pdf
    • http://challendor.com/fckeditor/upload/file/zeralagovunixegoxijez.pdf
    • http://jfac.kr/ckfinder/userfiles/files/59331715347.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857b613fd07---kimajuninilejanibu.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/58d77a7d5966a55bcaa10f8a797bd80f/84793522201.pdf
    • http://vitanova-cattery.com/upload/file/ritoxotafuka.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e94b5992b6e449ed8c31d18e9fdf7eca/puzufekadupomevanoxobe.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/846d95baabbd063c6b816f3eff8f0c5c/88276150337.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/82196200605.pdf
    • http://al-bandak.com/userfiles/file/kedulojosudima.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=in+christ+alone+pdf+sheet+music
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 16792 bytes
font_01_sfnt_off000104f4.bin
dcec475e552f8fd5189479291124c7149c50c5f24700a475444c13cfcb6f5434
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 10936 bytes
font_02_sfnt_off00011e11.bin
a8b0af92406708fd7a887fe5a1869affa4c46e40f8db1ce4232714ec8cc48a9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 16528 bytes