Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4acfecd677bb0ab…

MALICIOUS

PDF

83.5 KB Created: 2021-07-04 02:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: db42134db13cb639d2f63feb62545501 SHA-1: 40f1e44270429728da5e2ad17196fe5f2ca1a5c7 SHA-256: c4acfecd677bb0abcd8c63d8fc84357bf4ebc1178a47dbc3cc6a7c551da62a7c
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing lure for remote support tools. The document contains numerous links to potentially compromised websites and upload directories, suggesting it is part of a link farm designed to host or redirect to malicious payloads. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs indicate a strong likelihood of exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://elskenecologie.nl/files/pufurepubegagow.pdf In PDF document text
    • http://zkojicin.cz/userfiles/file/defudivofuze.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/aa4b46728d5644e940d22d0f786876bb/98051283045.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc0caa589---molofudumazez.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/sjvdgfq32hr9n4mdh5j5jkdacc/65399819279.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a12962f5ae64f3145dca907d65d0974e/21769360289.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/r9bnhkh52bt9egptd05i3qi3qh/2634225825.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-18/20210618011401269818.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/r9u0dplrqqihavltafhk91a0h4/seresowon.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/supenikomulogazegadajiri.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/lumuvapunimofuk.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91bb03bdff---gupafevosi.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609884a5821fa---77176049950.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/datorokoduru.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/99575814803.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/puxeboxemumatu.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/5ce85idg4ja6orspdk2iik1p52/89377695335.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88accd8ff---77064204529.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b2cd528c48330830f5f122685c477ff8/kewivomabonexadewibotemo.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/nulisepizufuju.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1000b1049---67640417835.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/pvsat0esphs2f9uk2nadf4ucnk/33635355999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=discord+how+to+share+screen+with+audioPDF 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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 17008 bytes
SHA-256: dc550f67f90cf88426a67cbf9ddb3b705cdf58ee4e8c236990e273cfc85ab478
font_02_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 10608 bytes
SHA-256: 4bd48ffa51b0ab7834128038364357f172834e7ba9c140032e37c9e1f921be2d

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