Malicious PDF — malware analysis report

Static analysis result for SHA-256 62bdf98c9d697330…

MALICIOUS

PDF

76.9 KB Created: 2021-07-08 04:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9c5ac06980c69da7cfcbc58a91426d6 SHA-1: 676c305791d2ec74df64303ea93603ecfba525b8 SHA-256: 62bdf98c9d697330b2253961a218a7cdd5e58f5f6f1a84d2abdeb733e8443759
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded links serve as a link farm, directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • 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://philabc.ru/uplcv?utm_term=journal+of+the+american+society+for+horticultural+science PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160abf82d95388---60017180595.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2999b979f---xilosagegunojim.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ir1us4pcsd4ps58evureh8s587/golekubukib.pdfIn PDF document text
    • http://bliksis.ru/userfiles/file/2758756107.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/kunemorat.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/nikibibunupu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d4cef36c---15132196764.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/0vd2125bukpg8fnkfkmdpdivl8/siviravamutamepamo.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/6610771890.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6oj579mber5ihctm268s4mrtep/rebisibegoruxegidovap.pdfIn PDF document text
    • http://hydrem.ru/images/file/18809018372.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/62926816818.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e412242ead---66312980453.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/48446394967.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cac04578502---nisokowigubiriloxepibu.pdfIn PDF document text
    • https://noddy.nu/images/file/10916297870.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/zukujokiloxudodafuroj.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/72101305627.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/senaraxunavoso.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/58183166244.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac02808568f---lumizewazinoduj.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb58a76309---29999844432.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_off0000c887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 10808 bytes
SHA-256: f27dd673a7a2985434c7ab48d87a2f4f775e18ece52fd060a248a8a14eeaf82a
font_01_sfnt_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 17176 bytes
SHA-256: 3524869c7bf65577f550e2520706ba17f99ebba7197bbf1fe0e18cd0ab1e5637
font_02_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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