Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97329dbbc1a4412…

MALICIOUS

PDF

82.3 KB Created: 2021-08-19 23:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cfae56106fd6ffbdec5c32e46e181d3c SHA-1: 4701c56a3e6c9a22e7ea9dc82dd481dd165cb219 SHA-256: d97329dbbc1a4412633aebb36f59cfe5eeb7c0366522aaa641a4b77479842ec2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a link farm or phishing lure. The PDF structure and embedded links point towards an attempt to redirect users to potentially harmful content, aligning with spearphishing tactics.

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4c4d51fda0c0d2690d3afe94335d93e8/29763193561.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/crcrsh63cj6j0411p5cq7qfqt0/nopalozanenedelora.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/21123603594.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/tikivudovukoxuko.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/mejojazuw.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bed69cd00---bewazanofew.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ad62884d6c8---getevimoliwopir.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/9nqo3j1u9tlvtl6t96oe8vjvvl/54289740410.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081295e351a8---43856293114.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/49eaccd811513b710ac91321d6bcc90a/wijelekotiga.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/844568d1b3d72c5d54b37ab1f17c036f/zizazado.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/bepupunugoder.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/v17mket8nr51j5c00tpumdp0dc/86918446536.pdfIn PDF document text
    • http://beiks.info/public/file/lufogabodipanemubijunimuj.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e91220bb5---8709383138.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/54bb7f23fe15c844976d284ff0e0eaf8/rosimorikibugudog.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/nafigabovulivasorubu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0e38787a2---kisakumone.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/27058900985.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e56615e9a2ccdb967b7aa920a5e9e124/xalejisazufewedarar.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/76446436381.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3f7b011d3---nibanukifurifireg.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/402831e5cd1f8e0922161f254dbec102/popuvupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=exercices+maths+cinqui%C3%A8me+calcul+litt%C3%A9ralPDF 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_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 11016 bytes
SHA-256: e940d0c77e0b2362bbef5726124b523425b8e84654fd37518bed7a5252e5f87a
font_01_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 18600 bytes
SHA-256: c9e3a01afe5578f3f015246ea118aafde01e2e9ce9e69e6b54d4ef7ccd2dc280

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