Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18d7f81e284e7a9…

MALICIOUS

PDF

89.4 KB Created: 2021-09-05 02:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 86dc7d090d34c9f5133cc8b23a212cfc SHA-1: 235fa53cb376040ebb8bebabf9b238581fa631b1 SHA-256: b18d7f81e284e7a92270f129c456e83a2d6ee555ea7c234552b7d3501e752062
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of URLs, many of which point to compromised WordPress sites. These URLs likely serve as a link farm to redirect users to malicious content, aiming to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing and trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fe95b7dea---majasexexesu.pdf In PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/53323406659.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/21533596390.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa8868ec8---27979162342.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160becb5e95310---67208335761.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/varukifapomerusitopa.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/16662649751.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/7037417932.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c219cc99ad4---32477313565.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/12133462057.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ab1e7fc5---duvisatogovudusofopixider.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160736ecbb74aa---vimebutexodaxugoveziwe.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1de19248---88972813557.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/emmhpgnna2ff84pdut93hapqca/38752565503.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210810_075349.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/zomizalowor.pdfIn PDF document text
    • https://073741256.com/uploads/files/202108151043257021.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/10177807445.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/25327671286.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/fogunemokak.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/27034603092.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/dopunk0tjpgbm9n5j9efmtpv67/vekol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=accel+world+light+novel+translation+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 22592 bytes
SHA-256: 07839a4222531abcf14c2c9e29de1518c6c09ca353d8ca04485373ed37334024
font_02_sfnt_off00013606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13606 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00013e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E03 11032 bytes
SHA-256: 0068b915d2bea111aecb3c78d8d4d7fe5057cf606a0214209111869a9be43a54

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