Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c0ff3adc823036…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 18:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4cfb32195f7464f10ecd8c73510c78e9 SHA-1: 5dbd359b5ebca72771f7ea123b4efef3b4704661 SHA-256: a9c0ff3adc8230362cb13ec3dad47c2974610670b1d00ed75f5f8be7ee0d7384
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits characteristics of a malware dropper. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The 'SE_ENABLE_LURE' heuristic indicates the document likely instructs the user to enable macros or editing, a common tactic to bypass security and facilitate the download of a second-stage payload. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/sixinatamamigitabez.pdf In PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/54150822933.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/depaxor.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/wofuvutaludifigon.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210908155555.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ss9f5vebop76ilk9qvt0ap0h7j/minuzos.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/18311022554.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/titojenanupabasewivudevu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312256ceade---vatowasunageputemevo.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/batefidetarope.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/58942854758.pdfIn PDF document text
    • https://angem.fr/userfiles/file/zarafotafotupikoguzegenip.pdfIn PDF document text
    • https://blv.by/upload/editor/files/janoxowan.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/tulow.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/81268429357.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210906_A7DFD1C5FCF77B81.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613283f238b70---27479712030.pdfIn PDF document text
    • http://minipit.com/data/files/vevime.pdfIn PDF document text
    • http://opsir.eu/files/file/33700927093.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/tefabude.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4bc0f1baf---24054568436.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/22572400981.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5ab48b8e---getuteviginufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ad+blocker+mod+apkPDF 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_off0000e6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 10428 bytes
SHA-256: ba5a4471879fdc7b225623290cd6dee5cc0640ee0e6034904cc2f7f1a822695c
font_01_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 17432 bytes
SHA-256: 0bca18309c0dc7d03c5d432e8224d48feeb1403d224eb3710e3e5359d25db9de

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