Malicious PDF — malware analysis report

Static analysis result for SHA-256 3683db7370200913…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 17:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c81c45d465da5ddf0fefeea2086f5f8 SHA-1: dbde166ab0bc0f0556b9cb5400c17fc74770064a SHA-256: 3683db7370200913c642c783f6041e0c2ad8ad77abdeed1b144d20b0a0246778
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://85560891.com/upfolder/e/files/20210816163118.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/90882882871.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8bs7qqvs91fjhetnm48oeoas47/sufuzudefukevepozopajuwi.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa09046599---93521720049.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//fireribetizazurisew.pdf
    • http://poetische-malerei.de/web/editor/files/kowegexozefoxizoriru.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4849ee07569aef3097a10442340ff0cb/91943592000.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6e6cad93---22478484060.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/fibapoxekasefovizidadoki.pdf
    • https://detmers-kontejner.hr/files/65121814298.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e8380980ff238858d6cfe5a92ee64c9d/tikuzijogex.pdf
    • http://iamsong.vn/uploads/files/43185125241.pdf
    • http://ukwoodrecycling.com/userfiles/files/93557916619.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a613800fb9d---gitasolatavazetamutowi.pdf
    • https://oilbasaro.com/web/images/ckfinder/files/20210719114846.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/531e9604a03882bba0dc2f69e217bed5/xusupa.pdf
    • https://ooo-kenk.ru/userfiles/file/85334469208.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f114ba6d---nufet.pdf
    • http://udaybharat.in/ckfinder/userfiles/files/47623901825.pdf
    • http://worldtile.net/jangheung/userfiles/file/doviraravupuged.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/96008694755.pdf
    • http://hzzxtl.com/UploadFile/file/20210617034656553.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=2018+chevrolet+colorado+lt+owners+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7a.bin
4cebede6f0e18f61d6a2cc9b298c9a33a5839aaaa8365f5717455ab3c0da4197
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 11200 bytes
font_01_sfnt_off0000f6b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 16792 bytes
font_02_sfnt_off00010ec8.bin
5f69f04c1a396f96607e68afcd9bc8c795cf8c23e1d51ef2183734d948d86fc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 19408 bytes