Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8945f6a8fc1900…

MALICIOUS

PDF

86.9 KB Created: 2021-08-27 03:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20e3d2773968da533e99d35b6000914f SHA-1: d76fc120423b6edd56e92d41a594bd4801ec0c7a SHA-256: 5d8945f6a8fc1900017c1ba0c3311fb307b7fe05558390a55aaf7ccfdb0af7d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use URL parameters suggestive of SEO manipulation. These links likely serve as lures to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://catamma.ru/uplcv?utm_term=merge+pdf+files+into+one+document+free PDF link annotation
    • http://markasib.ru/ckfinder/userfiles/files/vonojo.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/77039933811.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/39ff6595a74c4354d7fd77bc1765264f/62287787130.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc69d0a14a3---xabifozi.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086320890209---79925173543.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210531_223330.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cda8f9c9553---57850938769.pdfIn PDF document text
    • http://billsky.ee/files/file/28239788295.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/966b96e326e6b6a4a1cb56fe50b07f6c/44536657578.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607833032cb6d---25418576174.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b897dad0fc4---37030299688.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/69360265296.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16101007139bef---pejevidarizewasedexex.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/pc5o6fs3smmq3jtkcvmbovg555/dajiredoxoriduwaguzil.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/nplsukt2p4530cffd5d1a5ame5/vurefagamuvujaxobegatan.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/jaduwinosorajajob.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddefa0e2e6---zifudebatenefoxelibaresu.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/jelijizonijanadudubep.pdfIn PDF document text
    • http://apple888.vn/luutru/files/deponuxikuzoxuxuzitovudox.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/zebilemupakefufiwusejag.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/55013520276.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/kesuziperovused.pdfIn PDF document text
    • https://ebooksweb.net/files/file/gatajapek.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_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 10896 bytes
SHA-256: 6d1f0aa85709b57836df7edbacc081be7e8b004d0b77a6c452b14a58c060ce10
font_01_sfnt_off000108a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 16808 bytes
SHA-256: 5deba65f33954718ff92172bd2600bd17be03c965402931e97a96de4980e4336
font_02_sfnt_off000134b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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