Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b37bb8610d8d5b0…

MALICIOUS

PDF

99.2 KB Created: 2021-09-03 22:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19486348e4005d8519fc568c88a8b389 SHA-1: d3b4ffc6e0fcb785a81f5b3d225b671d19dd01fe SHA-256: 5b37bb8610d8d5b0d095af6b1636db0e79d29bef05289ba198b36c0ef9589e6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to initiate malicious actions. It also features a link farm with numerous URLs pointing to compromised websites, likely serving as a lure for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=pdl+microdrive+elite+manual PDF link annotation
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/jkr5eir3sd3bn1c8u34g2b8bpd/fapigemetujisuma.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/tapuxifasumivo.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/232333595.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16104b2258d09c---71261981092.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/18265926203.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/padijodedomonenodogefo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6495celek3qas44orc7vspjehl/4832882748.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/08a31a162bd373902ba17008a08e5844/96612863491.pdfIn PDF document text
    • https://areicon.com/images/file/76630811376.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/denawijo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c27e3327---92199119609.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/nolimagufazojoxumoxevi.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/lapobu.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/fisesodisutubir.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/75637e5a61d089bab713ca9762451ffc/46985639959.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/68465800752.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/bujejugabelotoxumibidukor.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/17634521135.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7018b517c---vubelasazoxevuzojomabazo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/r1f7t9glu24fie90jt6ia678pf/82472887578.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/powibap.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/bavexafapupikopunawokuf.pdfIn PDF document text
    • 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_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 10532 bytes
SHA-256: 764de176f1bd65c18881d37269ff2f390782bb803a8a7a7d3edb9dd2ae59cdfe
font_01_sfnt_off000136b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC7 18620 bytes
SHA-256: c9d17a3a4667d7efc1e6eaa240e114f94a6b1bfd807d06c64f64d13edabfb0a2

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