Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf9e7bcb8666783…

MALICIOUS

PDF

86.4 KB Created: 2021-09-21 22:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d3008801bc409c3d35c86f36d2e8a67 SHA-1: dd7526cb3fc81a057b1d4d556a0de42e1a63d134 SHA-256: 6cf9e7bcb86667837158389de83bf89f21e599217e2e279483e8bbf4f1d4946e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to serve as a dropper or phishing lure. The embedded JavaScript is a primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://linklandhotels.com/upfile/editor/files/zikuvezitexetumoderut.pdf
    • https://goodnest.info/tctt/sites/aaa/file/30287258698.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161352dca8e7da---89370748953.pdf
    • https://kenadong.com/contents/files/91427041070.pdf
    • http://nmways.com/uploads/fckupload/file/fajezasedenukinufumagun.pdf
    • http://clickvay.com/upload/files/saxotederavozimotiri.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/zewawi.pdf
    • http://mobilenmr.com/files/files/70748104968.pdf
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/zejelububeliviruzagi.pdf
    • http://daieimotors.com/js/upload/files/sitesisesimafegija.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ulkanq27a7ve8jl9iigot367t0/sudituvexaposinol.pdf
    • https://vildmarksjagt.dk/userfiles/file/pivaxogasowug.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/be1449e13a9a5bd263ef3ecafb7feebd/noxipobu.pdf
    • http://hightopeducation.com/cms_uploaded/file/79195392425.pdf
    • https://jackyrouxmethode.com/userfiles/file/92435953323.pdf
    • http://exdebt.bg/userfiles/file/3910684650.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/saregaxasexenurukisuv.pdf
    • http://iglozawiercie.pl/zdjecia/file/33090088369.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e3b2f277---8996123455.pdf
    • http://ganteltechnology.com/system/userfiles/file/68891845400.pdf
    • http://www.moyekolodin.com/files/bewikuwiruxevaz.pdf
    • http://locthanhroyal.com/upload/files/zefurumozipi.pdf
    • https://etevent.itweald.com/uploads/files/6135f55b90ee3.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=modern+combat+android+game
    • 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_off0000ef5b.bin
e9c27df47c90ab49de519e0d4a9ee7cfcc0babfc685287d49811ccb55c123946
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 17384 bytes
font_01_sfnt_off00011c27.bin
6ffdbea1cafcd745eb87d591f1708640f780fb0fcc2a3e11a484fa952e43697a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C27 10632 bytes
font_02_sfnt_off0001343b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1343B 16792 bytes