Malicious PDF — malware analysis report

Static analysis result for SHA-256 d042ee490c8a1bf3…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 19:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42c13c2b5b424802a0bd5dc8645c10c3 SHA-1: 567b0d83b5c959f558b6fa75679f814cee203a90 SHA-256: d042ee490c8a1bf3f3800dc28c85d30446a6ab6b1255451c4848c7af1de23b06
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 WordPress sites and disposable domains. These links form a link farm, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://novafish.it/userfiles/files/244583487.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613182ee25084---kupulaxevopedutaniwesipe.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309b671c7fc---gopumexisu.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/27674961141.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/70901000465.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136383fe1f9b---gasumezulovoriwukuserip.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/paxikojafewiwaxavulepo.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/11529276419.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/91044579292.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/zevimix.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/2888671091.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/pogewonudowewolevuvaru.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/gaxaritavoxew.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/31387408331.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/punit.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/zibel.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v2oiihfrl1obh5ldi7pfm0itj2/zukapij.pdfIn PDF document text
    • http://fitviewer.biz/files/file/pesiwazawataraweb.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc30740e88---digotanazul.pdfIn PDF document text
    • https://isleo.com/i_photos/file/23723019751.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161301af25fcd4---pulowawasibanelijup.pdfIn PDF document text
    • http://saint-party.com/media/file/zuvupamunojekupatudovalim.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/girinamikotux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+audiobooks+mod+apkPDF 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_off0000cd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD62 16996 bytes
SHA-256: 12cfb33fd1b99d389d9ed3b94b3083737a7a9d19e74640185e8dca33d5c17c51
font_01_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 10612 bytes
SHA-256: c776d769ed9eb01bcb9cf7b1ea65bdd7065b9d6f5bc08cf76ce558e9b859aef7

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