Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb364357141da13…

MALICIOUS

PDF

144.9 KB Created: 2021-07-17 07:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7b7e9ca428b4ff30c78b97a23edc98a5 SHA-1: f081c527290c8ff2d0cb06fc67b642b1dcc63e4a SHA-256: 9bb364357141da1330ae8ff4450e00e2e0d9a49fec1eca98bf180a0d4cff9797
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ov3a0vbqmo2dj7bbf5nrq1s0f3/joxigov.pdf In PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/81eccf12d8cfc9239e9fadcce54e3d74/29174620477.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/42681480113.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/rgre4gijhocvd922esk403hv2i/79083287714.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/lasebidepufedogolid.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7cbad3bf7b7cb317bd0001128588bd7b/fesamux.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mhj0b1lc0mo2vt040bfmd6fu17/jadarodujopodopogemuxosas.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/406c4d2043da4beb97ea7abc437ea604/97487627798.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160944f0187501---8585306001.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m2m5d8god310g6rvr2i31g8tk0/koribuza.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/43053127125.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/12895810480.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c88049372c666aa03ae9a1457d576660/62706595337.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2298119dd---41957456085.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe61c5719---livapok.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd541ca52d9---bumujo.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/niwutifibaduvemepodotubat.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/xepofibananafa.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/194cd440337a52fbabae144a13b87f7b/dipise.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a947472201---63212367244.pdfIn PDF document text
    • http://masonhn.com/d/files/toren.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/gefesilosed.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e8207ddd4ab8adf190a422e8b80a4847/79039765199.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e6bce62a---44805816262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=social+conflict+theory+of+agingPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1DE 10636 bytes
SHA-256: d7bdf8c5c5b197b03fce5c118914fffc0169342f9e39e3d508817d726787d23d
font_02_sfnt_off00020a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A24 16972 bytes
SHA-256: 5ff1b282452c0823f0c5732782064852499a32a166841fdd81d49216c657058b

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