Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f17a0abab4753e…

MALICIOUS

PDF

100.8 KB Created: 2021-09-01 06:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f3d9179d75100c6c530a3f5b0806516 SHA-1: 6875e4c33f211631faa2a411963a175a8949fa0c SHA-256: e2f17a0abab4753e403af70e8b405a43e8d9446769b5e7a8b4c97474a4f2b368
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to potentially compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://my-natural-style.net/upload/files/67387762162.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b56e764766c---dugutegiba.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124403f60a48---fesanuweratujegesakepaxi.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/lusazakepog.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/70342589695.pdfIn PDF document text
    • https://tipresentoio.it/images/file/31413566220.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/76900771057.pdfIn PDF document text
    • http://someteme.com/archivos/_20210728065435.pdfIn PDF document text
    • http://agro-partner.com/Image/files/xuxolif.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3146d09a---deragiwiwuxa.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b27d69b6---rifirarudulopexupoxin.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/temagi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990f920c070---59739282788.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/jidofuwakirovigezuwon.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9819303761ad90680368a0e08e49c093/lifinopisatoxisika.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05bc48b26b---penoxubove.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087299c74c22---50090057050.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/67268345636.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072492fe3781---90344305773.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2e7d1b0bd8908774900bdba04163f308/didagipoda.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5nv6blr3r028dcshdjgul6e19l/vawejavisepop.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817180de6ec---41355274546.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/84197281060deea891aa51.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/16682701029.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/jegoxigufifuwerep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+hi+how+are+you+in+spanishPDF 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_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FD 10596 bytes
SHA-256: d2f5b1295eed4750ab9769c1a24a1bcc0fafc3382ef7026f7463d5fb9b4ce037
font_02_sfnt_off00015142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15142 20132 bytes
SHA-256: bfd5f8a0a6f690090972dc92abafbecb1d8be39fd4218d5d5f72fadd3d3697c7

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