Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5ee84c526185d5…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 14:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aae53ffdc03fb5b77c4be44bdf22d4ed SHA-1: 3aa4cecc97eaee4e82135bf186b520120a0086c9 SHA-256: 3f5ee84c526185d5b6dfcb9c3011614b7ae6c8b24453d9d4bbff03f3db63dd59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. Although no scripts were explicitly extracted, the PDF format and the presence of external links are often used to deliver phishing lures or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nibejunibofifib.pdf In PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2b95f1b6---muwopogomemunifixelig.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/pabusodogajiga.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/rexometax.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/36628079043.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/tonuvi.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/94209222568.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/bepotetanoderolobinufanu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/falerexubagitivaxuloti.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160920010660f2---43109831628.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/varumefulorukujiwirer.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/gimavubogutiman.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/2eokud0ahvq9viav1tb30hm0eo/roluwunug.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/35547134281.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/93253893527.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/pksash9jvnab7effh481nt0c4j/27601591386.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610fefcd5195d---88483551535.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/jekixamimewadovuge.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/xegipok.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/25829156101.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/bekidovoxek.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/2890740cb6ffa4f9f9e49373ad47b97d/pikuvido.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/34636648363.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/97d7e4cd7ef405eec5cd1251fdba539e/buxujugowowegevenodirosaj.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc5d72835---varakami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nelson+grammar+pupil+book+5+answers+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_off0000c14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 17092 bytes
SHA-256: 4797b6533cc67f17f317b96e735a7b5eea7f3596150836631fe2737139602b9a
font_02_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 11272 bytes
SHA-256: c5af00f2d7a417d9bbb68e81e2a3d01aec70207b796f9556c2997f276c180325