Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad2512e82ad83ed…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 22:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 070533dfa876502edc28f4b0f06f5349 SHA-1: b700c12ebf1ad85fb768cb6a1d0bb505ec50c8d9 SHA-256: fad2512e82ad83ed457d939929d551262d25b50714036097bf9b24803fce11b6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of a link farm and the nature of the URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://isleo.com/i_photos/file/24779841193.pdf In PDF document text
    • http://brickform.cz/obrazky/files/kinejoxajerawukunumimoli.pdfIn PDF document text
    • http://knauto.com/upload/file///falojexivamodijis.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bae56c9f223---26725375046.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7477161dca---66756845356.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/povizidapobuvuwo.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9387958a3---tujufenorekeforomipejo.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/nkid1804v36u2v3es1na21b1t6/turopebab.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/80296cc9a0e30b773e2ac7293955e8e4/14427137607.pdfIn PDF document text
    • http://punaide.com/userfiles/files/gatasalivuzo.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/71225522418.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a756de75411---63811649937.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796158dad45.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/mipitonogu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c8e9610645f10540179f6e27953bddf3/mubozunati.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///lidenulikibaxabelowobejek.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/20906538579.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/ximofubiwuwivuz.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/b6ofd2cp4snom43ohp4b3kp9a5/pinuwizosilusokakuzaru.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/refesarafuxaturevugab.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210628050528.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/79944843053.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a112d02b5---deluwisog.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba14366b3---kawewezifore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ro+ro+ferry+bookingPDF 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_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 17780 bytes
SHA-256: f3c9ff761586989a2664c50048cfa8e9bddedfab27f5c15cd1a3e2615e9cfb80
font_01_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 10304 bytes
SHA-256: 3d17be6d77350e74fbfabde2204eac84325c31bad0c6aed94d70fddf60450c11
font_02_sfnt_off00011861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1