Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f18ed770a82100…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 05:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 791020cc269f5176c91b53306802b475 SHA-1: 3f8faa154038f7f9baecb87d52400dfc0c02f928 SHA-256: e4f18ed770a82100138ab29395ab1048dd4a27422fe2a0e4a6f698fa51debc8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archerelectricsupply.com/userfiles/file/rezogufobobepugum.pdf In PDF document text
    • http://majortaylorride.info/images/uploaded/file/sisusekopimapune.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16083e0b29abda---nagip.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/23820184623.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f0bea60a1ee6d19a882916f5638fecc9/74494557596.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/nezarulewizuz.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/livewu.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/varatelet.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/xelan.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/xumokizexexugeraworixafaz.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc262909a8e7cc67e5f7a3e2d2dad9ac/69954793795.pdfIn PDF document text
    • https://spacio.hk/attachment/file/gixibasapegiwup.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/takefu.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/kixiwodul.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0affc8055b---nuperejojakitebamoja.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/kixawi.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14943037405.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/wezagidij.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/sd3hbknh18e04cgplk7idda610/zusiloxude.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae93a72ec---mumelaf.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/67787561354.pdfIn PDF document text
    • http://esangsok.com/upfile/files/toxaxejazixiwoga.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b73e4605---82509063538.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c895284a957---fudifubujalawupevad.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/c7cahek6u394frp5j08qke49d0/62482611311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cognitive+apprenticeship+theory+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_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 17460 bytes
SHA-256: 8e6631839c01ef32f996f98da14c41d828475cda18b70ce5c56e8c6330e7cb4a
font_01_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 11064 bytes
SHA-256: 4b82be11e6028c7586330ec8aad33e4704227c190d6807460adb84eae8ddd28e

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