Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b975d02508c2d9…

MALICIOUS

PDF

89.0 KB Created: 2021-07-03 21:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: adf0a42bd57795345ac8e99dd3a0d268 SHA-1: fab8f8cbc9471a71e57e6c1abe358fec716cbd05 SHA-256: b2b975d02508c2d992cc6523795d39fb3497878f7e567b7908ac70d6473963bf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts social engineering by prompting the user to install a browser extension or update. The presence of numerous links to potentially compromised WordPress upload storage and disposable hosting further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristics point to a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://beepost.vn/upload/userfiles/files/fabaga.pdf In PDF document text
    • https://mangonebike.com/uploads/file/pemesadipifuligazawanadi.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/31407604688.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf3b52808---12574079277.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/cbb27c562f0f570e9ea108bb945b3645/97936513331.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1ccbfd14---bovakegudanilum.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/645a35bfd612c9652057d090444c59ed/68455545245.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ki9cit2j7j5oflovtlia22jlcs/ronaraxiwusarobov.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/wezugite.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b00a148fd51---36961041230.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcace70f56---94422604971.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/vafebolubudofigozel.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7c05cf2c6---21961306344.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94798693510.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9cacd1f9c4b582dddd238c30a4a8fee6/38415153513.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/xorovunep.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0m3s5lrm80lg19o8euqpsa5ota/29590517949.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/fonedus.pdfIn PDF document text
    • https://belloverde.net/emailer/file/81876209879.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a6612f49---16689856394.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2de20358e---62682334424.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/bazulovajizesix.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802dfc3bfe1---zepaw.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728092086ec---jazimubugavutu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/11468709551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=harry+potter+full+movie+series+download+in+englishPDF 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_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 17056 bytes
SHA-256: 6593ccf38c6c9fca9e9a56c97567a273f6692ffc1f77e75063196424ad7c0c02
font_01_sfnt_off0001223c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A53 11304 bytes
SHA-256: 3a4b72c9a41d9b98a7e72a38351235a54316cb42c3f35df2522e6f81bd4cd170

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