Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b01686672a97a22…

MALICIOUS

PDF

122.9 KB Created: 2021-08-04 20:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a49a85fdb66fd2ba6f8c8acd84157ccf SHA-1: 3eebe7dd99684c9f7bb32ea6bab7555a51b1ecc3 SHA-256: 5b01686672a97a2278079b7ae9d4a025215edc17b378d0064356491be18b63d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm intended to redirect users. An embedded JavaScript stream was also detected, which could be used to facilitate malicious redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://o-dance.com/upload/files/62316080944.pdf In PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/7056908720.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d4d39cb928f8d5c1be2c7af642387a8a/xofevomewatetux.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725857330df---zadarimes.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/fanijugodufegupowetudep.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0afb0166d---19280349004.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bcea13db5fc300a2234bc4bf08b1adf/23351793207.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6b4826b1b441d13b2073ae50894f4828/38194545875.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f088cf62d---79982647938.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/fajurapugi.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/70956560997.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/717398db593d0b538603cd064eace10c/firopamakisime.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/gewisederazamowen.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cd0a62af3---24325887720.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/zunemujexoxiwav.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/31754591627.pdfIn PDF document text
    • http://abpaluso.com/upload/file/gakurafokelajokal.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/noxikokeliwen.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/85914423042.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/sezerisufolude.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/71820727915.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/tofisofulose.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/zifewusirenefixuwo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8035d13c14---4981782645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=trolldom+i+gamla+stan+bildspelPDF 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_off00017acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000192e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192E4 10836 bytes
SHA-256: cf79552e4be4dfc80c7e3fb770039946a832903b360c4c91bae2862a705f488c
font_02_sfnt_off0001ab66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB66 18968 bytes
SHA-256: b94225bbb60779e66fa1f4f4c6d12de38df9e0390811601692084de4c7ea1bff

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