Malicious PDF — malware analysis report

Static analysis result for SHA-256 665714103a8346f8…

MALICIOUS

PDF

87.6 KB Created: 2021-07-01 13:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cc2be5902caefc43fac9b59a2ed340df SHA-1: 5ad84c3c773c3a391101952600bec5b933a21fa6 SHA-256: 665714103a8346f87653d06226706b40f32048ca0a30664dc87ac814f7c834e6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and a raw IP address, suggesting it is part of a phishing campaign to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=download+roblox+mod+menu+android PDF link annotation
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a88d77925---roremu.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/biwasoxegidowuwogi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/505r9ucseeheajiq9p54ujono3/bugopejufogevima.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/xapaxuterowig.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/zedejatiraxodobiz.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bd75623a8e29bbb249ac3d5efe79e0b3/buzatasufaduketepudepip.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077715a1decd---81045245546.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/fuxaxobenagojivoniw.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/nekagoxelugoketoxadixofa.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/74697903314.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6cfed8b6c---60312326070.pdfPDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dmjli2ts3sjljvbt5rbol7qcs2/40108970443.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210527171033.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/fivem.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/wuxosuvipapir.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/25899198920.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/foxutotuvanun.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160854157e4cef---45255487703.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/qa6nhre6eg6ugo7nnlcfg60b3t/sexasurubara.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/82244357075.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/76236417132.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/vivadabuvekag.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d84f41e934f---82994218961.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/piwaforabasefexenu.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_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 17556 bytes
SHA-256: 53572969147920cb50e8b21be1bc966f0532e9f57228a04d2053700e2027cfc9
font_02_sfnt_off00013931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13931 10572 bytes
SHA-256: 5493809bc3cc4b4445d80c956bc6319cf7eaf2a639e64885f6124396bd2ac967