Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3c2c29836db393…

MALICIOUS

PDF

80.3 KB Created: 2021-07-06 08:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f84161ae77d1e1910aa88f5a12a62e4 SHA-1: 34f4c5b8c2517e0b5dae9e94878f58b4592ffa10 SHA-256: bb3c2c29836db393a36302d46bf2dc04e6af9ffb655b5aadb5261ed98bc37a53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery, aligning with the Spearphishing Attachment technique. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/64911287429.pdf In PDF document text
    • https://coluer.ir/documents/file/52486687483.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7b18bee1fc0acbebe2c6a428459abfce/96606164860.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-25/20210525205301843475.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/34230641323.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a600ef56e50---58787530001.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d6b36b39---xalabobojodokunozetubop.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609807d438924---24302519893.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5b05f1633ea8c04eb8b6acb758de9c05/18693440185.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c85dcaa1---xuxotavekuxu.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/39570230805.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1424d7686b---62056466223.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edd564417c---jufojojakev.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/49266556958.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/niwivezilukapijunapezat.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kf2bc62f9dso96tja8ijfnfvu0/86496748965.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/56013870429.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ffe4784cbf6ad063953b5f11f13fc459/xezozanurojakakutedimudiz.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/najuzemarizipasidewunowu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7774cdb30---donedijabudutedawererugan.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/retumanofebunoboj.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/jli2s7d06aeovjk5rhal2h6gc0/48342144640.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e7baa56d2---jusukupedetomofuvevafodi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b28a79d3---46970444031.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a5778483cc58782fa991a3ce1ea37d19/36575675495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=wherever+you+are+collingsworth+familyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc76ce330b---dabonusetanixiwunoke.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_off0000d3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C2 17388 bytes
SHA-256: 531c2e45a69ed62ed17c61501eede7594a66c91fcd8bf3fcb85699609d63e12d
font_01_sfnt_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11973 11140 bytes
SHA-256: d471f59867b6f0e7dd2cea4df0d9d8b607e34b2d263020844b94a1c1a6eef776

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