Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d72dea449523c2b…

MALICIOUS

PDF

79.9 KB Created: 2021-07-27 13:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9583463602e7366829595a5d9e704bc7 SHA-1: 2e6da591d2bdbde7f1428cc93926d9b61b09233b SHA-256: 8d72dea449523c2b538919bef9af599287a07130e38504931654845e4281581a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm, with multiple distinct hosts and UTM parameters, further supports its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://portalkucharski.pl/app/webroot/media/files/9642721990.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1e5a2e60f92bc70121bd3ebf931cc9df/43741067167.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef2ba88e7---38007868208.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b4b775221cc5c8c886de4b984fe1b928/bazezivifamoserip.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078647718c16---xodepuvuxurujovir.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/mapiligilefedeluwa.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ded15d6791---77980042176.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160baa2ecb71b2---parufevepupawukoni.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/30b37ca8a405a02c1ba53e9050679138/74562122619.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210706044419_8tl9z2.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/jimijikokoben.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/71858245058.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72b27ad23d---92854154775.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/tabejef.pdfIn PDF document text
    • https://rajakedua.com/contents//files/zopalim.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/tewafivewabaruje.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/17893976755.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5708a5080bc71a325b79cc8844e91958/megumedezisoxizuvu.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/67191455990.pdfIn PDF document text
    • http://texmet.pl/userimages/file/64265249925.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/60331302662.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/28979021843.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b599d075207---14969974362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=telecharger+super+tips+bet+premium+vip+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC88 16100 bytes
SHA-256: b165d95f952a7eda90b0a3b5769bc534ef17debb068cd88ab13d9ee5988bdf3a
font_01_sfnt_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 10956 bytes
SHA-256: db50af18eca6d19ef047331674314f10d3419a6b9020ef489d1e44007e5e6e33
font_02_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11782 17372 bytes
SHA-256: c04029d899367afba4c6c7a0caf4c8c2239aa5716bd43e36a2fa9ac46c55f53f

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