Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a226103590f37f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 15:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6abe3e40b02e7ae3bf96b1010c81c0fc SHA-1: d509f4eb40c10dd6a7725d4d7ffca2593cfcc2f5 SHA-256: 07a226103590f37f03a44503fb3ffb1bcb94e52a6637d7a915dbd81ba3ba642b
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 or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through a link farm. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://mousike.it/img_ins/files/fexuwolonofofegawavufo.pdf In PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/347014933.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/zuwosas.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/76415679906.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/93824259822.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f02de3392f---98836890454.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/15103827643.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/wipatitagegikivuxag.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/38406178096.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/korepezedodovifo.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/59224254897.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/52141152834.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5516124be---16622640702.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161313a192edb3---30649211778.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135139832cc6---37931240790.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/anvkn67a6ddm3ta2egiplgc547/zusitipekuzovugagub.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/68352444712.pdfIn PDF document text
    • http://bushurov.ru/images/files/6244654262.pdfIn PDF document text
    • https://doitoutdoorz.com/file/wjuwUqwj9LRwkGzF.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613450eab13f0---midutibudixanukudedev.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/dea52734b3502569b1e925f9d441530c/zigugininoleko.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/15141676227.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/85017674839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mod+among+us+for+minecraft+pePDF 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_off0000cd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD92 18116 bytes
SHA-256: 85f6d3eb30621aef667b0d7f218c138e80cd9901315310102c43211f81bb295c
font_01_sfnt_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 11012 bytes
SHA-256: 25f1edc56da0fa483c734cdce739c7b6b177c252d6202238ed2623ff49f7ef17
font_02_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1