Malicious PDF — malware analysis report

Static analysis result for SHA-256 673750bbd1a1613d…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 22:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5c364d0e341d59fd57ca1a8bdf0dcb8 SHA-1: 29263d4e319fe8dd091b356ad8385c63518aae68 SHA-256: 673750bbd1a1613da271ab0ae7b300b7f5df24c142dec9027c15ec99e6da83fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crysiq.ru/uplcv?utm_term=five+nights+at+baldi%27s+game PDF link annotation
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/57316746326.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/sarota.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/pikuputewezemewubopamuj.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/47327177937.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/jofunubazasugisa.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/woguwofukudotuxupo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139318b81ff6---xijasajezorevovikoj.pdfIn PDF document text
    • http://sun-tes.ru/files/file/5765475276.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/34559980979.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/92b27692b6b3733ed8d9103c8599b3ae/66472775863.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/witelubofefimubu.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/gomoretegusudexiluwuj.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/zojoraxemukox.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/basimojelivekikewesugu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161440db403bd6---tagude.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/42947029613.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613849e6e102f---supofexajufiso.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/vurapavizobodipedivowida.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/jobedizabigexoboguzepik.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/14081330715.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/86886093287.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/82542e885dc7f6103354c06913074b5c/wovepapugapozefupoxe.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613703f16a0b0---dusodu.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0708418885c4e4aa73660c134bea646a/84311735655.pdfIn PDF document text
    • 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_off0000b20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20E 16376 bytes
SHA-256: 79cb9d239f13f40fb928d58da00c2bdcd008f6bea7664f8f8d4f4770a848d2c8
font_01_sfnt_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 10692 bytes
SHA-256: 30b72a799880975327b8a2703102529d4d53e09721d3af16555fce6b8306145a
font_02_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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