Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74515cbe2f2daa2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 17:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ccf3e627e9adadd43eed7e39159d297 SHA-1: a749c534e28a6273b7407f4d35e34ab82253869e SHA-256: f74515cbe2f2daa2478c3139d17c4e9fa03091cb6f033d68e38b67d08186d6d3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised CMS uploads and disposable hosting, designed to trick users into downloading further malicious content. The presence of multiple external URIs and a link farm strategy strongly suggests an attempt to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=android+on+mac+file+transfer PDF link annotation
    • http://saipanbooking.com/FileData/ckfinder/files/20210913_EFA39A4CB23E45F1.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/suxutonefubobufowi.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///vixanujewidepoxudiredoje.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec29a46c13---remusowirirelisuwekozuz.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/gofugonu.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/22593235368.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/26079203771.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/18781782910.pdfIn PDF document text
    • https://yasacompany.com/upload/files/bariwimopibegiboka.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613492d966c5e---bikifefivatibonutamuro.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/29517992249.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/44092473825.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/gajazeroxedumi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5c1b4ce39e7583929a84f909c6e549df/refuzezifepudok.pdfIn PDF document text
    • http://packturf.fr/files/60414091466.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/duxerozinebowomujevo.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/79800513248.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/pijarevujimotebuzuditobu.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/sexoju.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/6507583842.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98379638161.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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 17780 bytes
SHA-256: 32d8e646bafa09142fa606b6270cae76458b7d8b76659f65f585a7f1464c9fbe
font_02_sfnt_off000127f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 10620 bytes
SHA-256: 2264e5d5993429a2c4621435652cca9f13115c8d2a129c195005e18ae3f2d68d

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