Malicious PDF — malware analysis report

Static analysis result for SHA-256 c647fd69a0fee022…

MALICIOUS

PDF

83.5 KB Created: 2021-08-16 03:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 73b210112f03e8d3baf555f2b5c26886 SHA-1: dc51cb1aaa2015819555f1bd0abd7e331daf3ba5 SHA-256: c647fd69a0fee022c7219c549ee4c865c30240c7e5ac25f8706cbaefe94b6fd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the heuristic firings confirm the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=de+profundis+arvo+part+pdf PDF link annotation
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8b30a73a5---14919587583.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/25199076212.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a349fc6963d---gutobanukasavebareleno.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210527_174345.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/38289714346.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/wixalanupawalejatimabuzar.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb8367f37---55431041413.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/65992168958.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610340c2ae7c9---dosexadosek.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/gawawusazuribepiwam.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0vk6jbt374ik2f9o7pgo7euut3/feguzu.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/34259218739.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/xowepuneke.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/40162603701.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/88126982707.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/t7nmfs97o7574u0fp35sa74pk3/12167563608.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/xuvijomapivewunexekuza.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607acff9c9ce1---moronubem.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/jiredinulus.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb6b4e9b7---wigagafekadazobogun.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/72006dab4a1324423a8795e70e737326/24406693120.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763c11226bf---12044025207.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/466e15165602e0dd4a2fd495bbd176f3/goroxixijexozorowe.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/kumamorobonelo.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/57606495650.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_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 10612 bytes
SHA-256: d3ee6a86233769732219a95fec596fbe3ba2691a34410b0ed21d0d56c8691afb
font_01_sfnt_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 18460 bytes
SHA-256: 7f4fa6e3ca23f206599bc26973e6dafd12609fb94d3e1d3e94f22240b326860e

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