Malicious PDF — malware analysis report

Static analysis result for SHA-256 b268c23d4fa945b5…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 08:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a4181e73f8cf6b5ac8ef2a739fe41bde SHA-1: 6fac03205ae646847ee362aa323272253a9c124e SHA-256: b268c23d4fa945b5d1bf52fe6c549b98787c86914df72bb7de47bbf44f563acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://avandcie-energy.com/ckfinder/userfiles/files/kotewuzosabima.pdf In PDF document text
    • http://sbairs.com/datas/files/dewepijibukupagupofusa.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/viruju.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/47183588253.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/50796672437.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/97793248603.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/75263689462.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/50502627124.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16131f231432f7---vukon.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/69324686611.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/pageminezedesivife.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8e3e932ec---29094630153.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/fekosefamitunafa.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e436724442---duvomobewemule.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/64942653581.pdfIn PDF document text
    • https://phuquiland.com/upload/files/67970539979.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/gidoluzavar.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/midofudagofiniwimonebeja.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/79051024005.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210909_B5A36E29968CAF78.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/31109627320.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/061651084960.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479a7f8c6d9---fifarawem.pdfIn PDF document text
    • http://generoussecurity.com/uploads/12602700813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+textview+spannable+imagePDF 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_off0000ca87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 17212 bytes
SHA-256: 7f7b56289c33fc5b79f8f6f3cf21cfe9bb483f090aa3d7fa28ce10081d939f5c
font_01_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 11112 bytes
SHA-256: 6c151742479e21abed939f544c1d353c61256d71535008703f8fc3e8f91133e0

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