Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f79bc1e578df89…

MALICIOUS

PDF

81.4 KB Created: 2021-08-16 15:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5198fbbaf1bc1f332b30f4d09bb12800 SHA-1: 6fae5eb3bb45d1a44b4fccf884a7a41b0cc94f01 SHA-256: f2f79bc1e578df891c17c7bcff2f6ff3027e438a4115f72921072737232664a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and also by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely serves to further obfuscate the malicious redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a345333a74e0e51f55256ce026d5be0a/88194034922.pdf In PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/11820004862.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/b06krr79rsov18j57krhn9d4b2/wezomiputusumenotivufuzi.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/wuzamerijodad.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd5655d089---xowiranaw.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/42343629422.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/31641270698.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/16581102216.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/xanoxumapobakawigamot.pdfIn PDF document text
    • http://innotack.com/userfiles/file/36709827236.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ff345be22d72d3cef019cf7f2f99bf67/64042439246.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/donukugoderosikufav.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63c37ba3b---7081357927.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/tagodaxetu.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/081700266208.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/vanogumojatuvof.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/9cd8df966d79af26990a5787a20c4409/22601537565.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/senatujibufisuvowa.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/torogekukowazowularopep.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/rck56lj70ofad19kukhjv6s6p3/42098851044.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/bckvcn1urgddtiva0h7edtd635/64855356653.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/sivomuz.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113aec59e87e---gezurerovazirug.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed32103012---31064422333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=libro+de+4to+grado+de+primaria+ciencias+naturalesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 11132 bytes
SHA-256: d6207311b925fb1256d6a5b6c1b31532026da9ecc0f1e3d9e39f9ecea5923777
font_01_sfnt_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 16872 bytes
SHA-256: 38daf86f05b14f30c8b85933e32d92575b6275983aa695790b820fb0e2376e8a
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9

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