Malicious PDF — malware analysis report

Static analysis result for SHA-256 398becef83d32228…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 16:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 674563f0e9b0508594cb8e9af08c435e SHA-1: 7005abb0a6857a843f203a0407683ff4504329d2 SHA-256: 398becef83d32228d00704e1aff6d77120145e8567e3b6b1ad1aaf94f7be16ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/25aajvsfsskjfhu6ql50s9hq6d/paweso.pdf In PDF document text
    • http://uceng.net/_UploadFile/Images/file/kudovutesotivoxutuzasom.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/78875013227.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a277460be7---kigomikiwojajirotefezo.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/niwibilekagexovasamipef.pdfIn PDF document text
    • https://atl-50.com/files/file/tekawute.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/82440372461.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/gezatotofojeli.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/muxavefi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b280d8a69ff---japokediguvunu.pdfIn PDF document text
    • http://abnicum.com/files/file/fubew.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079842028ff6---nofidavezi.pdfIn PDF document text
    • https://33mobility.net/uploads/files/mavazuxaxeluvukepixiwuwok.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/87758858539.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/ronefisilufake.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6a3260e1---99918370632.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160795223320f7---varonuleropizufovetu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mq021m8gh933jbdihtgukf6u26/gizepavamedogi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hekp3b87v6l61sitg1omc3btgh/50026399968.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161038555bb661---mixugafuvek.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/bigijujodidawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=been+and+gone+exercises+pdf+with+answersPDF 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_off0000ca24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA24 11092 bytes
SHA-256: afea77aeb0a7dc908750d530093e6e833f55219f3ebef80074a5eeda7adb9e0a
font_01_sfnt_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 18468 bytes
SHA-256: 8c0f6a70d6a3ee92028ad1282f3cdab1a7f0fd6781d30f6b5a9843bfb7e0c561
font_02_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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