Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebb02b3dbb6f278…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 05:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a821a102936086076378bbfc44f9a122 SHA-1: af0cd8843ad985834947e27d01df0764823b6114 SHA-256: 4ebb02b3dbb6f278d681bffea4ae52f9901f2dbbab93d31dd2f2d72859c7bf74
136 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or distribution point for further malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using algorithmically generated URLs on potentially untrusted domains. No scripts were extracted, but the overall structure points to a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=ideology+literary+definition PDF link annotation
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/vedeninojodijusewefun.pdfIn PDF document text
    • https://makenie.com/upload/files/mitituvaxovedibuduzozu.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/pudareleromimisapi.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/95384177540.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lesufupupovu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813917bee29---39773669478.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/tavubegobonipilexuxov.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/1lr8je8l0a17vjffa7ibjncto7/20444378344.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607943a048914---22530925803.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7363772a65c9b7c1466da031f13fcc73/sosomamupuxegiwixakika.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/tu28j62vd18vsbkri11tav8fj3/71983901806.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/tojofapodirikelisa.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd66ac898---nurunibexipurijazupenerug.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/galobifegemozigizotix.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/puc5rbnh3ipu33nj3bplbs6r1u/86821855829.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///gevatuzuseminemoxukuviwir.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/97766375472.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc19fa5f53---31385031970.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a22021a7c---37772376787.pdfIn PDF document text
    • http://mesterek.net/tmp/vomiremewukovexed.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tepeperir.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/kidusuzufa.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_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 16444 bytes
SHA-256: 7528de7b2c3ae0d5fbcf8a189d5cbfdd40608b258c54ef89506ba12e1da587f7
font_02_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 10424 bytes
SHA-256: b9bfd47194de7bcfe67d28592681572e214e002dfd57d8f6fdfb63e002038157

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