Malicious PDF — malware analysis report

Static analysis result for SHA-256 833f012ad43f1ac3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 23:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3f2e04460907622219ca2686a2d4772 SHA-1: 910e144d539c90ec2747b32c92cab9d9103097f1 SHA-256: 833f012ad43f1ac36b9819a1a93d25fc7559532b1df07c90d37b0c476b6b7944
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs and link farm structure are indicative of an attempt to lure users to external sites.

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 http://thedewakohchang.com/image/upload/File/2410116015.pdf In PDF document text
    • http://hockeydh.com/files/ups/files/jimijebogurutonuruxor.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/91106259648.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/79602679494.pdfIn PDF document text
    • https://devismesport.fr/userfiles/file/lagudamogebolapugube.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b6ff167e---34007094202.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/de02d32d0d76c734edcedc41d18134ba/gumub.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/27209303747.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/3de55d687fb132229e5a60108063cd90/27977950714.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/hekratr8779pu4re5ba6mhb6sd/norepoxafuzolosogafokepe.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/menodariwepo.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210801181537.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/21080509205.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/51249278668.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609af20b25e5f---24652669207.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/lujotaketan.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210717/file/16264990825462.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ab7f2670f349f6962777c8736dafef49/wijofexive.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/ruzaj.pdfIn PDF document text
    • http://emyorganizasyon.com/emy/ckfinder/userfiles/files/6150221674.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/25050410338.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/69228163830.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/31102901577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=introduction+of+low+back+pain+pdfPDF 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_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 10684 bytes
SHA-256: 8837c990af3cfe77cfbf2962a5dcb9457eca7c0cfa4101cac8dd256658bb7736
font_01_sfnt_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 17928 bytes
SHA-256: 907c3a248af312b1a499068292ab398ccbe9e50c323ffe0f4d96ac5dcfb9b4d5
font_02_sfnt_off00012d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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