Malicious PDF — malware analysis report

Static analysis result for SHA-256 712e68945281166b…

MALICIOUS

PDF

67.5 KB Created: 2021-09-27 11:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c38dfb8f60371dd9fd2e32e3f2b095e SHA-1: a77700b16b53e9c1569813a95351fd0b2364f2ed SHA-256: 712e68945281166bd9aa72a1e45cf9285e1072777e15c2d947cc208d368023af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing sites or download additional payloads. The external URIs and link farm structure further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://huntic.ru/uplcv?utm_term=does+a+phone+have+a+recycle+bin PDF link annotation
    • http://njchemland.com/upload/files/98134035244.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/nafifitematatawup.pdfIn PDF document text
    • https://zzwgjx.com/d/files/dususanuter.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109200913076200.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/senawalilo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0ac03169d---badobalenivuforelekunef.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc429e062c---58667714136.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/176736837.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/bexarewige.pdfIn PDF document text
    • http://ipublicity.cz/data/file/sedorirolaz.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/48021537584.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9a9709658a9c7b7d1ff12450dfd295d6/kumixajane.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/75930894227.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/39649876fde23151cf1f1e28a82139eb/mazozixigidewilesimade.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/70020345516.pdfIn PDF document text
    • 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_off0000a6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D4 10692 bytes
SHA-256: 60ae85589aacc315158e2bb8e4fa71726a3be4b9fbd05367794291a7c6a4aa48
font_01_sfnt_off0000bf10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF10 16712 bytes
SHA-256: 943d1358730a599426f2aa48459019c4009a02d72d37f81aa21b5279ffc936b8
font_02_sfnt_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1