Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51e582b54eeb640…

MALICIOUS

PDF

89.2 KB Created: 2021-09-04 20:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 100e538635a9a6879322d0e1da0cc159 SHA-1: 496d9a4fac569c185f825a5515ce634defbb33ba SHA-256: c51e582b54eeb6406a4f8ee7b10e4a466a8cba921d68a3fcb2c4c158fdaf3306
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of multiple links to potentially malicious content and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qr7qfb8cq5tlqcfdlso3eavnl4/delunuvixo.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1289a979b---89467640937.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e0ddfda035253ae6b3b29d59d2e8af2e/lowulubijaxezusinofadofo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109be88ccfd9---22113602723.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/19528713692.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a24de6bb96---dujonupaxuril.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/kilojoderatinidirumapi.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/lefimozisiwobus.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/lutasemidux.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/xukevabalafawikefi.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/pirinid.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aad777a8e17---fonutiwepuzek.pdfIn PDF document text
    • https://fond.ru/userfiles/file/lefelemu.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/95307452633.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/xusuborimimowerowabutof.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/vazegokoxewijip.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56a81b1dfd3b27a0a93f87bb20f5a687/9797681991.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/23204856839.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b3ce6ce1---guletugikofusofunumudop.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076d90c1d248---15374176367.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c36631408---borexuwegibototojezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=3+phase+motor+kw+to+amps+pdfPDF 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_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 10776 bytes
SHA-256: 690648c368638952e6a855c0677062bb891ce1694afc0c32cb62698663292e09
font_01_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 21036 bytes
SHA-256: 1b5e9e9111f44c146939d1a035e62a8dd4f7c5d8c2952a4d05c6cc3936705987
font_02_sfnt_off00013fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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