Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc9d6fdd464ed27…

MALICIOUS

PDF

130.1 KB Created: 2021-09-05 02:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10b82cf572fe9d2fc24698f71cd78ae3 SHA-1: 98a419dcea9ed5e9a5425280ebb3014cb2657ead SHA-256: fdc9d6fdd464ed27bc228c1f56129dc3b84b55e1e39f0d1a284ba54bcbc5f693
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6523

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609002ad0e001---kewilalarobibi.pdf In PDF document text
    • https://partnyor.az/userfiles/file/bewovuperutanalosirak.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/62930891346.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/13bca2b9fd06e3e254d611dc7fbcd0b0/pematiposumatajulaxanox.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4664a2bd---2819389616.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/70068787044.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7702765fa2---zelaseketemobumavi.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/77985099963.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/22540335743.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/lasakofawofim.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/83setsgcgi5jslje0apafg01c5/fobuzovewifenotuzog.pdfIn PDF document text
    • http://zaiger.ru/img/file/73658216972.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/32f458c5ba1852af41517924bb6b05ab/17794405121.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5e9255ee83fe4d7c2a39320ed4f32e47/63166503518.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c52ded9e3c910dcf0ac684b12d16a3ba/72724833586.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/41673369574.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76c92913fd---12782199509.pdfIn PDF document text
    • http://elpijisystem.com/file/50371260526.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/dad075e59e2a78b9de413095e889345c/xaguxodezonididilorivuda.pdfIn PDF document text
    • https://marigabung.com/contents//files/rifalif.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/80615109636.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/veselizabimujurapefi.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/bekak.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/32518775399.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/zoferofim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=alcatel+u5+manual+de+utilizarePDF link annotation
    • 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_off00019e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E2B 10520 bytes
SHA-256: 4f3b33754eaf00c2893a12ac48fa8357d945b92c89b2799307023fff35702fe2
font_01_sfnt_off0001b628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B628 20888 bytes
SHA-256: 92db0c88ceb42571e16fc6ec19d5909f3dd1e9f35f3f07e3588221a705368e0f
font_02_sfnt_off0001eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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