Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd2a4551d312df1…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 20:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c1a80d9d5d3f464ed3af4458b0dfd1d SHA-1: 9109bbea6eb9e7fea7645e1c71f888a63acf80df SHA-256: 3bd2a4551d312df1facb08d58deae306e13011240f99ffee90e63ec2bee8b163
164 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 sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://angkaganjil.com/contents//files/52962884058.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/1532kjur64b0m5kaqenkjd1cf4/xajigimajivifowuxozox.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44469938567.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/98037439247.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/81955085366.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//banegibevuribizajut.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/96261529740.pdfIn PDF document text
    • http://halmar.info/userfiles/file/30695952312.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b643ac96---72286563164.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3555e78909---nalafutowukek.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/d961b1055490eaadfa57c8225523bdb6/86848278240.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/xebapajugafumogemivavi.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202108040934471920.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/bcb0e7770b1e6624f0b1d14dded8c626/buxebaruvonelexafive.pdfIn PDF document text
    • http://jucal.es/images/file/votul.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/38133510736.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d255bcaf76e597ae32bf7b08fd23299d/pikijulove.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/nederotow.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/mekulegakawabesapag.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075acf913109---99123925767.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/nenegujelet.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/33184984998.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/firapupisovumazibukuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=windows+10+open+pdf+not+in+browserPDF 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_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 17172 bytes
SHA-256: 9ebbc80088465f3d1926896605dba5c690da03ef098c3263528656de4d8ede56
font_01_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 10676 bytes
SHA-256: cd0e501df1afbbd8d3be35fe82e1fde28baa7b1231e66b7a932e4187fcaf524d