Malicious PDF — malware analysis report

Static analysis result for SHA-256 4707cd6e2bfe1d44…

MALICIOUS

PDF

98.4 KB Created: 2021-06-26 22:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bb85679ec829ec27c11807ee563effa7 SHA-1: 1b8bdc1fc92e2968925e0058bb7cbeab2fcf1983 SHA-256: 4707cd6e2bfe1d443b90ae6ff071a8216a11ef37eb82cabe627960b6f841441c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised WordPress upload storage, suggesting an attempt to disguise malicious redirects. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3abceb62bfca5ba3f4506f3ef7d8d607/74847774603.pdf In PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/dad422df30963103cd1c60bae151aabe/novutejetugigot.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085410dc0dce---76105486919.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2b27cd53---76538318766.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a152d4b517e---figuwokigaxaje.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/25515651776.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/dilisesoxovevu.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/nozumob.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/90786084599.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/95140738739.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6bf6f327fa7eeb611b4c661a3c072343/12190957531.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/vepokumubufataduz.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9db348dc84---gerejafegozekifag.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160beb46b2bd9a---lexogomujibigu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16096819206cb3---56155140502.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/f18944f4d373e653a0dc58f2400f6247/likezef.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/2510884250.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee621850e2---nugujanod.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/zigirosipeka.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ajnjt19i6nl6eg8u7acj6mmn13/siwikifugukof.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/d2dtnkbu6f60o447k3o0lfie2e/47826852304.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b310ca90b91---malimexosenupilo.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/72531164788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=i+suggest+you+shouldPDF 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_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 10232 bytes
SHA-256: 76868f530e08c2b59fdd01defc6e341469882c753c99265a7c410c5ed9c42bdd
font_01_sfnt_off0001337d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8F 18768 bytes
SHA-256: 11c6219f7e3430e3884c66ec28c0ff0cef9ace6f5de8418b877aac2a86152d98

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