Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5856f340655c868…

MALICIOUS

PDF

211.8 KB Created: 2021-10-05 22:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5b799e5f97f46dd7ce8416201d0e3658 SHA-1: 0ed26aef631edd46b2289ab07d9532714e6894ea SHA-256: c5856f340655c868ab8f823b31f215c86618ca1e889e5de5a22d9d9016be6527
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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.
  • 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://philabc.ru/uplcv?utm_term=top+grossing+movie+of+2001 PDF link annotation
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8234f5059e3591e2df72cec0a944dceb/25918270197.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/42834260529.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/gonakopujenowonarekepegab.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/tezopesitilafeniwogepuxal.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/78937544801.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/37395641476.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138891b72144---zalulitemomalo.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/69766538613.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/muluditobuwepaginurarevet.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/renisanosasep.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/nabojirevowutomumenuwi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fd5bcb330---48978558306.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/mixixorewafepeda.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/94853984313.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/93031954785.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/napatebaselowozeras.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/nazilusokefavuvikelaribow.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/11068122960.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/ketotiv.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/balopoxa.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/94614798227.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210910_808872C6DF88D543.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/lewujebugonojivilokug.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/2916515377.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17922393751.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109222132254980.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_off0002d240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA52 23632 bytes
SHA-256: 2a23f5323675e05c198a4806201655f54a4290cbb2e1f256d4f387c3892dd0d3
font_02_sfnt_off000327c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x327C5 10716 bytes
SHA-256: 7bcc1af0fc5d77623753b6cc7c24c9a4da98d0b8edcef32ce3035f72993728f1