Malicious PDF — malware analysis report

Static analysis result for SHA-256 5273ecd8f96e0839…

MALICIOUS

PDF

112.6 KB Created: 2021-06-26 03:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ca397ff7da46f8161159ed388a2d270e SHA-1: bd7bcffe53535ad3bf81afa37344d67092b05884 SHA-256: 5273ecd8f96e0839618853759f9432b4078ce04e71d8e2ba8f627bf692dc086a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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 https://infrive.ru/uplcv?utm_term=wot+book+1 PDF link annotation
    • http://adamlegal.com/userfiles/file/87362410912.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3b8d1384f9c7a62f6551b93b62237525/53582701094.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/36880948f96a270411e5f51dc2ddc0fe/xodusexapubo.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6db8f11dd---92957602854.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/rd10p5aemf9iv6il5gdplu5kp5/65713786261.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/63875ab9b962884a2fdd08d029b79a82/44089498104.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160837841d316b---64003887168.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/65714929829.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097942491d9c---92988658814.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5e7c77b710a6519434a4eb0804a49a05/78812393422.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082693581e52---todesimopudogerozuzegipik.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/80fef920af5dd190aa14e009d720b66b/lunizaxuwuweniragebatiwir.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/felawinewuwegigado.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160745da66b637---disutuj.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/06bfe46dd55cc5d00f715d8cea6eaca6/jewonetalutotidudevalev.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c571244f6---35229840150.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160896f3331de7---nibixuzatevuragoxa.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/67092982530.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/gibojeribokor.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/6197569484.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c746a0c634---39486462588.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/64729758294.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a265367e6---76849953044.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/654ep8kv90jgs8hpr09lj3srch/rosalurizisodaxodasu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a12318778d---92757434133.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/a7019d4bd765d1fa6e877c8734985510/xawatef.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000167cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167CD 1812 bytes
SHA-256: 4c4e12c82964419e5a7099c15aa8f5ec91a5f4d9e27854e4e8a4e6d8c107bf08
font_02_sfnt_off00017056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17056 9576 bytes
SHA-256: c2a11b3ee2c45458d0f4dbc9bab86b638d805b8988a3a008344d4d0d69dbb591
font_03_sfnt_off00018531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18531 17980 bytes
SHA-256: 8faf336af1d0bc1e894375df02371793d35701730d3114a96535b01a29467e18

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