Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c46ea46be160f63…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 19:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 110759842867cb8ea59d52d38a2e0b7a SHA-1: e4d0b1538bba06288d7b40e3c24f8737ac7e6fbf SHA-256: 1c46ea46be160f63b6c3706462664bceeaeeb5ae02b07fb3c538683f6f3e8832
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://studiogaleazzo.eu/userfiles/files/rorigaj.pdf In PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b44bb6ef1---fatobalini.pdfIn PDF document text
    • http://designfromall.it/userfiles/file/75543786871.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/qhldcm8c4r0esvqe5mug2inm70/zazubewozekaxux.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/92e15b0d11cfc39f7b0865fd625bb41f/wuvufirowumekigizuki.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/wikowukufobosuvilupib.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/812be9fb43aac5265cef0e7898939521/zisedorusivipexemije.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/libogulofolevogip.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/pivopesumepotifusa.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d71215a4396d40c83a73672e1dbe6724/90495003268.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/ruxunapidawe.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/7derml9r777ikp2l1e75jhoafq/69465714525.pdfIn PDF document text
    • https://wsbtitan.com/images/file/4631841339.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fdc981d7cfe2d99bea8133a5b185cacd/24574870670.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/dca211bdfc58f90ddef0406d952a06ad/mininutofaf.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/878ca27d0f6d0aa0e40487b9797a27e8/45190712173.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/4549342202.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/33d71c3dqape3q6nf1jldl45m2/zozajekugedilokezejaro.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/25431343.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/nilogowo.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/35520092403.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/xirujudetuwepisubisitawad.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/xujexutiwamalopusujoduru.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9c51b23d76955c94699242f87e87230a/62452643952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=frozen+printable+coloring+pages+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 10972 bytes
SHA-256: 528a9947c07ece27a6278ab09bd807c430224bd3dd5dd25cd7d849a84b55ab05
font_02_sfnt_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 20056 bytes
SHA-256: 582e67326ba8db00f26d558973908e77afa7c6f69a1729b540099679267502cf