Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff157dcb18d57a4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 20:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3b968451bd722fbbb5709bb3b04a82e9 SHA-1: 72fbf03d7c27d19d5810eb974326bd469df90418 SHA-256: cff157dcb18d57a4433c58fc39a100184b1f0bf8fac6304ed7a04fd06b71c4a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting sites, suggesting an attempt to distribute malware or facilitate phishing. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure indicate a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hk-sai.com/ckfinder/userfiles/files/97675363719.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac8670ced---87864338370.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/rokemiv.pdfIn PDF document text
    • http://safetruck.gr/images/file/16021052100.pdfIn PDF document text
    • http://generoussecurity.com/uploads/sevebipupiwa.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fff34eab---lowigisanuvokif.pdfIn PDF document text
    • http://teknis.it/userfiles/files/segejovogitan.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/dadopawoguzuxajuf.pdfIn PDF document text
    • http://weldingplaza.com/files/file/6738617644.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/71302109464.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/bd7cc56d28bdd7cc350b3faad4b2fade/rakitexomegapanigapegan.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/93858932899.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/60322740131.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/25005480116.pdfIn PDF document text
    • http://watch62.ru/files/files/kusixazofoxe.pdfIn PDF document text
    • https://led7.ru/file/43837588780.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/97520680751.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/mivaxuveg.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/nepikanefelutunuwi.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/toxapegoruteriko.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/77502373458.pdfIn PDF document text
    • https://istanajp2.com/contents/files/36097117923.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/jogafazifetowixoxezuvez.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16142c12fd9b6c---22151173396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+dragon+village+mod+apk+unlimited+money+and+gemsPDF 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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 18700 bytes
SHA-256: a9170ef52d41c98db1f839173bb96553ef6fcde7953609bcabb483d22344ef1f
font_01_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 11192 bytes
SHA-256: 0a9ea9476b0157c56a8126330ff42a0d9ff4654f1f95cd62e1f163a6db9b8879
font_02_sfnt_off000123c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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