Malicious PDF — malware analysis report

Static analysis result for SHA-256 a710a32ed4eb35f9…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 17:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a383fbd1362836a702b62bd840b05b86 SHA-1: 7606984fd92330315580d50e2bde08757ab39a45 SHA-256: a710a32ed4eb35f9e176ae1451155f0487ef9e8ac3eac2051774e65e1ea8b620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. The presence of a link farm pointing to various PDF files on potentially compromised CMS upload directories suggests an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a lure for users to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://gaytonfa.com/upload/files/vuvufujidejukute.pdf In PDF document text
    • http://tcsklife.com/filespath/files/20210903210116.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/89225484755.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/babajerulaxonanejabuv.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/puwijozulena.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/78829327928.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/zogigegedesufeluduwexale.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e6b63525d7d3b563bc7fa916426696af/defug.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/jagebirumukefitilezo.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/88358808994.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/25987392846.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/semaj.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/jumezejizamisupex.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/gizekuwepivanubujapam.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/rapofeli.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/qhn5mgb15faf56vud253fg6ip4/rinofatades.pdfIn PDF document text
    • http://rongqichem.com/upload/files/mogipaziboporujul.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/gumozajonamosera.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/9313069249.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/galelozaretalesum.pdfIn PDF document text
    • http://sergeybazarov.ru/file/38806630777.pdfIn PDF document text
    • http://hodori247.com/uploads/files/87899099001.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/33407444767.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613918639b191---sajusomatimituwazefoke.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/kopikawufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+final+fantasy+viii+androidPDF 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_off0000d119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 10484 bytes
SHA-256: c87f01886511cf529032c3e77b9a2accfcb9bbd847ec4b547f2b071d3362b422
font_01_sfnt_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 15936 bytes
SHA-256: 1060921ee666ba3a8f0c447815f34c1356e433595d9cd539ef34b3e2492ccee4
font_02_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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