Malicious PDF — malware analysis report

Static analysis result for SHA-256 497fda49d56a3925…

MALICIOUS

PDF

98.6 KB Created: 2021-07-02 11:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 690bf8e9fb5bd1c7c6e8311bd19c108d SHA-1: 356e8955ae987ff6f5dbe40e09c5fc883cd685bf SHA-256: 497fda49d56a39258bb82c561d2591ee9ab5e63dd31ca8a69894fd73607db5f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to initiate malicious actions within PDF documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable domains, suggesting an attempt to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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
  • 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 https://new-baby.me/userfiles/file/denexigeku.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085249255a9e---lapulejexaravudibefilom.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/65464309700.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/0p6ad8as3kkkbpgbsnivg8viv2/71992125909.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/ef9me8312s15qmdp1g1h1uujsk/67846312233.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/22658867491.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072888fbbb98---91707216256.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607740f16bf6e---dokobobexu.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/366abef44a7ee8b6d87dd06e99425fef/netunowupakegemepuvur.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac260599206---womabukatomanumekamagiwis.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/78729593799.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5b4ceff04---doronitebigip.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/nitidezarel.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/botuvu.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2401f428c19c7a2b66a527675a8e0848/vuzonosudope.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/vdj50om1p66ff08qjq8hmc79i7/45497128361.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/gomuvaxixepuwuxogereze.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/58422993711.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/85778202326.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/zajekutazuzufetupoxudoxav.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/8155b7lk08jt2mo8nrt2uo2cf8/18745624241.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b44954cef55---posulatinosolisoxi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/22ba60e1f223be4a38945d7a043980f9/batetozekokez.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/55904507294.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1a9e271c3e0cf807429b1ead8d79fbdf/98235529261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+noun+form+of+anxiousPDF 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_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 16416 bytes
SHA-256: 840184d613f057484fd865f0d2c0ec739f494c4a737741c3f87b1ebd46e2aefd
font_01_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 20684 bytes
SHA-256: b071f016092c60fe34105adc4b90ab238879eb7afdd17cbf1ab55d16d3f25b76
font_02_sfnt_off00014c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C15 10628 bytes
SHA-256: 73cf6baf01d40e7a8f5fcc51aa241294645a8ad497f83a612d13b4c0c36a3afc
font_03_sfnt_off00016447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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