Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5362a5e8be38b35…

MALICIOUS

PDF

90.5 KB Created: 2021-09-05 14:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75ec8cebbcb07a9736673fcabef38f56 SHA-1: d8f1412a278f986b8fcf69ee1fc6e6d2fd90ace0 SHA-256: f5362a5e8be38b356fe29d5b8d3fc9c4f1c3ae99cc1231d30c8fb388989c7714
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites, suggesting an attempt to host malicious files. The heuristics indicate a link farm designed to trick users into downloading content, consistent with phishing or malware distribution. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 10

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712263f1f22---vutakaxatelewawode.pdf In PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/tipamivevoxokewitiwofofi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d860b766fc---6735938525.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/gubulajazogedulawal.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608000c0d8a0e---19065408025.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/43284494592.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210531031005.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/5294809268.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac390bc744d---13396821375.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/27501532172.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a107292093feeafc7eba9be1a8a8fef6/zojinupurorujijoloripu.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/945n2v0biigbunepidd6j5115q/11741101454.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/nipevogapatikumetuv.pdfIn PDF document text
    • https://pindimana.in/uploads/file/85315662894.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/simuzil.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/0uj8n2mohojoniodtum52p8vq3/11580194658.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/zelolekiwululilujoweb.pdfIn PDF document text
    • https://cargobull.cz/res/file/61735879329.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/28439272127.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/7i01e2ta0leljlhjv131i2stuf/60941077541.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a7cp72ssgas79al4vkikonv75/jarabibizuzederenisexosu.pdfIn PDF document text
    • http://bptramptour.pl/files/file/34431455917.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/ninadadojojijibidavilavox.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84ad2b895---4543151323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=netta+12l+dehumidifier+manualPDF 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_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 10580 bytes
SHA-256: 2542ada80fc0b44d90883d0be13e71b3c1f1be68113cb904a622ed5c4af0a084
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 21844 bytes
SHA-256: 5e5da636ebcf3473aa999c3d075a100ad7a80814b9c67091a6c649d015e71746

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