Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d495a64a965bcf9…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 18:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fef233c8889cb9ca31536e02cbc3dd19 SHA-1: 0bef7d9951edec89397f79888d3a96d82518d71c SHA-256: 1d495a64a965bcf9cf2da5c6a4dd2973d7b0870453833402c786e2fc62cff4ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs, many pointing to compromised or disposable hosting. The document body was unreadable, but the presence of multiple external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cometsecurity.in/admin/userfiles/file/ruzadaririjawaxiwax.pdf In PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/64641597795.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/45092695667.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16145ecaaa8a9b---deduruzesasadizuzab.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/59679334292.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-22/75469abb95b35272f29ec70f9ad134f6.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210926140020.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2e94af4cf7cb3f5df4414d5a831e9151/wisavadonejikab.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/faguzipe.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/rerimebexowusovekamata.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613caeec62a93---89959169092.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/452304821612ff2f0bb9d4.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/joxidefofefipaxiri.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa783ce69a---fewisofedudejiwa.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161482280d08e0---16344757322.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16147b49c5f782---52164548045.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161361190e35b5---30891976240.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/78486081084.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/96414441702.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/lusegikedalugut.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/naropetarij.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/suvewopemijugax.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/wetavara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=extreme+car+driving+for+pcPDF 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_off0000b334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4B 10900 bytes
SHA-256: c5cd854bb9d545bcef68cd751a32aa28b623971493254aace5f8a6fb39896461
font_02_sfnt_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 15196 bytes
SHA-256: 968d7ee3ecc7667b2f330ab47353c0c028e1f1a1b9291af2012edcf959ac3575

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