Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e60dcf5806d1cbf…

MALICIOUS

PDF

92.1 KB Created: 2021-06-30 15:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 658675476d263f507a35a9a20073f40a SHA-1: c5f315f0bbebb35546c5c6abf9bf82bb0847a028 SHA-256: 8e60dcf5806d1cbf82caf167f328ab6846e650b51e1bb65e7404c90b896a4264
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9590df271---71430670371.pdf In PDF document text
    • https://goooinggroup.com/userfiles/files/20210619_191906.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3f73bda64---wanoga.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b13e5e128---gogegorijepowi.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/nafusu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gccgvjfkphccr672q7pvrfofvq/41206994631.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/71f309e6b02170df0b7efb1c72ee3e2d/dajasumivokedosa.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/pesokezikitituwagab.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/157717bc99a5e63997882e38fce728e9/15206882676.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607df0ba38b5c---45055140287.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/rerov.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a49536f4---sogolerasezunenol.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/baxadebewurevu.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/demefatonosup.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/wiwufadufuloxetuk.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/wipin.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/sojiwuvosunonebetisipenez.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f2e78857---zolojonipukegakiguvowirop.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/25/file/20210525_193037_124.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/43246288267.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad22af0d0---moluginimosunebumuvononu.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/voranedegojokaxuvoxasofim.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7607d9fb7---jasitemiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+woman+caught+in+adultery+meaningPDF 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_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 17040 bytes
SHA-256: 0f9b61073fd8290d4f38626756be1787d753522a485b05145bf15cc20822425f
font_01_sfnt_off00013223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13223 10912 bytes
SHA-256: 67b8f6fd7cdfeb904c3e6f545ae5a93565fd86e80404f61948f27c36130ff437
font_02_sfnt_off00014b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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