Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24c9df7399d51db…

MALICIOUS

PDF

69.2 KB Created: 2021-09-02 01:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 985892b4eb70e49f5e0737b4cf5a1da5 SHA-1: 4b60704351a364b71816adb5e09f63d09bbd8210 SHA-256: c24c9df7399d51db9f112ab9069baa44f4d6380583b28df651668cb4a7d9e352
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous external URIs and link farm heuristics, indicating a likely attempt to redirect users to malicious websites. The presence of compromised CMS upload links further suggests a pattern of hosting malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=how+to+earn+coins+in+fut+21 PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ed17bf757---fujofo.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1d4nvvobhob7v6h346uflim2ou/28250614430.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3b6cc42c3d522631edaf1331c43c9eaf/vavinuvarexusixude.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/bifetenixex.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/soxuxu.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/13542912289.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a28941e396b30d17b59dcdd5afb8a1cf/warogaliniw.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161082a63849a3---vofunosifusatot.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/nulivitililalar.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/20067111888.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/sunedorefeviganurijivim.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/85058e691156539a8b94e5d2fc5355f5/ditejifutujejarirefosoxi.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/46115665250.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8fba138c6efb93bc8a462ec0096d5d0f/lokudubekiv.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/81102518661.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e25ba025e89---voxolusuxiwawalinonoxif.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a46a482d1e7---50322296702.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/310105701a2ffb72b45af8552fec99ea/35483815592.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/66341111148.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d437b50df01c9cb38706a3325a9a0184/63543103433.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa2aca429---17381250331.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/petalidakimowuvitavo.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/50769498144.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_off0000b378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 10632 bytes
SHA-256: ec01e8609f8c97e8e59dd59ebc6eda516753a0d313febdae2de1afff49322ae9
font_02_sfnt_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 14432 bytes
SHA-256: 538323b21184a8360c6ab9a370f18403e2d9024c6505320d4f21d9a0d7b51a22