Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc159911141e284a…

MALICIOUS

PDF

82.6 KB Created: 2021-10-11 07:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0972e5e72a24d0e8fcfdcbe04417442c SHA-1: 32dff33dc622ef542e4dd5307e308a52506f8e17 SHA-256: dc159911141e284a4fa23bce11296491c2d422fe9b02f4d801c8a3bb1cfc9562
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, along with the presence of external URI links, strongly indicate a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the overall structure and heuristic firings point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=income+tax+calculator+excel+sheet+download PDF link annotation
    • http://adacu.org/userfiles/file/20210914040727.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/zarutovuxev.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/pisuwedirupiwizep.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/kupuxoxux.pdfIn PDF document text
    • http://ariege.proximeo.com/ckfinder/userfiles/files/pamixesumolamiwox.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/japopojifexunaxefixuw.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/25925805599.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/21660547800.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/11529847778.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/29374865570.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd2110bcdc---zafirosuwodasaz.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615d6929d868a---86690495914.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/79271756921.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/buziloz.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/26535704889.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/sopog.pdfIn PDF document text
    • https://egca.fr/userfiles/file/jopimojupozisezerenot.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/2457711261.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/31262185566.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e1a924863ad2cb91bda4ce8c6c624daf/58856003661.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/gidelopikenot.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/90368837476.pdfIn PDF document text
    • https://reha.bg/content/upload/file/tamukiwekigusanuxata.pdfIn PDF document text
    • https://skl68n15g-n2ox.com/contents/files/titogirogidesuli.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_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 18000 bytes
SHA-256: 74564b4f57cb6a07cb77fb613d45d4b3c1edce4d79e25aa21ec35bcb6e7464aa
font_01_sfnt_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 10784 bytes
SHA-256: f434a33c4beae17481c99bfee20bc819dffc02269a8a5786f6177d459e3d3b6d
font_02_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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