Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ed4e08cff3f561…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 06:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4cce87ad9e396ef66b4cb9c7463392c SHA-1: f88b377de3ee612d164051a3650dcc4999a33e26 SHA-256: 96ed4e08cff3f561aeb1e5d098ee2e73f3ad88f4da70ae136918085012c85313
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a phishing lure, likely delivered via email as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d517701825---dusipatofijigaboridilobom.pdf In PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/bidurobusema.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/soberedunowib.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138465431099---68714628864.pdfIn PDF document text
    • http://parilka.by/var/upload/file/nogomuminovojo.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xagasaferi.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/72198717092.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9bd6bd8edbaf75b8f1e9a093df45af06/46254057721.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/93579959099.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/xakepekab.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/17841046922.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/wolux.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/pufabumupaxujegoterewe.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/4918636848.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/nerezujukasegokisiv.pdfIn PDF document text
    • http://js-space.de/userfiles/file/xokov.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/kapisenoliletidumomuker.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210902_141917.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/22964423651.pdfIn PDF document text
    • https://visualarchive.bg/files/refuliw.pdfIn PDF document text
    • http://caythuocnam.org/images/files/92335565902.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/82236217713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+does+nfc+enabled+meanPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143370e9b619---46241629135.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_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 10684 bytes
SHA-256: 5a25f03a2711dadc54769160a81560188493eb0b353b15f21ed08560d4e0b98d
font_01_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 16984 bytes
SHA-256: 63e325f2c41e5b7f5e720f09186cbdf668554e2f14331c09437e6f5ed07551f0
font_02_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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