Malicious PDF — malware analysis report

Static analysis result for SHA-256 63601be1c3fef55b…

MALICIOUS

PDF

81.6 KB Created: 2021-07-18 15:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bb896a2923e204b769449eec67eedeed SHA-1: 02ae32119a3f79e63396601f09a9119bd5d12b4c SHA-256: 63601be1c3fef55bf92b2f7ec620f7d29e6332e8b14b8f30fb8a192c2494eb37
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4322

Heuristics 7

  • 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.
  • 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.
  • 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://andrelandberg.com/userfiles/file/70012779590.pdf In PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/66647488810.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98f21e7e6---rowuvotafibekuvetevurubix.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/55930084759.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/7143092421.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c8fd4a6fc426280e2254c2c37d02ca2b/nubodadixa.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7f2f4d769---fofap.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5d2f35260aec954e7c398a4e20ce84ec/nesimogusamaleb.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/jopubeku.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b5d0f17eef32ef9c32e073dc7db5e1fc/pubepuburenufi.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/cb3ee7cd8245c9cf0e59d131bf22cd31/48024839860.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cd111e3bb---timosojedojanit.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608289086f87e---kesubexidug.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b784c581e3c---91506560091.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/41973157783.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/wixejuzesut.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7857b2eba6---71726120875.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/74972234905.pdfIn PDF document text
    • http://edgecs.net/documents/38803730338.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/tiloz.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/solevab.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/4t4rfg6bj9i1v2c9da185mjhp4/61453043939.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8522790fb---nabiba.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/fakizolubed.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/1585937193.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8rups9pu278brkq760bjp5hfu/63907995672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=when+do+you+switch+the+inequality+signPDF 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_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 17972 bytes
SHA-256: 49847437011a604ec8d91a13636c638e24025e81eae48f134ca44ff733db2444
font_01_sfnt_off00011391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 10988 bytes
SHA-256: da5bffc3c40ae33a8aaf6aff4ec5d3498c237ca8a37b095ed6ce3da9d5bb3511

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