Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df38f62dfdfbe05…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 17:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a945f160783433f9c5b3349561aa98f SHA-1: 7287e484c1bac9abe3222181bcbb50401f2e7861 SHA-256: 5df38f62dfdfbe0574d02a67f97240e0d18a7b754b6ef1ec3104c1c4d8dbf87b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=hemorrhoid+pdf+adalah PDF link annotation
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609afb41b205b---xaleparuzobubakalekame.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/desizi.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/31427217521.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/kivogegelevam.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/97960091726.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c091b6a8b652ce01974b631e33707e4e/fawoximojazimuzu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbe7088abe---sijasewo.pdfIn PDF document text
    • https://derfo.info/resimler/files/29733399035.pdfIn PDF document text
    • http://htwy.com/upload/file/86596561677.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/fedezomokerisolopepag.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/46938781274.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a3ab40328349d395e66f035c65c60e82/81693777830.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/pimadikud.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/4ae0b113c2a95009e54263639c79d2f6/18571588365.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210707_5897DE0FAA4DF976.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0kk1u0imu8okef828qvjiefgg/ganibutol.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/fl8gag9ona18jp8tsmb2olqg1n/dagewuvat.pdfIn PDF document text
    • http://wami.cc/data/files/famigunakejul.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd88eb6ed08---lofifurisedazevejibowugi.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/27881132127.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///65141157883.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a90646da06---29422002643.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda2a42ee4---81561865512.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/vgsrum72e9cffhhn0eju2okkka/50576606336.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_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 10384 bytes
SHA-256: a1eddfb1b96e8837401152f85cfabd8a3a2f1fa2c60bc89bc8cc75cd80b251b8
font_01_sfnt_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 16908 bytes
SHA-256: 5bd011c75fd9d4a59f7a0e5b4ab6112fd2b9e59e9b15ae219023d5c52a39fec2
font_02_sfnt_off00011d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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