Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4a2238dfdb12cf…

MALICIOUS

PDF

93.4 KB Created: 2021-06-26 20:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0e4eb5cd069d040aa374593a74f6c6d SHA-1: 4f128cf36f0f1de2f95e94e7d0caf3ad08235b01 SHA-256: 5d4a2238dfdb12cf2410d99bed426d5457bb4da8e9f62e0f3800bc1011e7cf91
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/31ddlegjl7lcbjjb62o4bun74r/43531126177.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47170cd9c4---91647675339.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b46bd511d---mipukulimesovonexaboto.pdf
    • http://coming-c.com/userfiles/file/59612450196.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/21418e84344c1c6f6b987f1ef183bf2a/mefunalanilumuzodeda.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b736fbea346---70047612324.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/48995db194aa1589db4beb17c235a4eb/vapunokudekisufopan.pdf
    • http://sk-uralstroy.ru/uploads/files/zifaxa.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83bebdcb6---48397441143.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0dd8b172c70806af8de84540bea2759f/konewanumipugobuz.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976f5d5399c---95568285057.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb98974cd0b---51634564630.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/61423851c9850c6a7946dc4ae5fe1c80/16468271148.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc955620d1---videsorovinu.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/f088eb69f4f6649a26ce8494898d865b/fijizituta.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/tt7vppknqkcnhkelo1q1i3e812/70176640035.pdf
    • http://tamlaproject.com/userData/board/file/wuvukilaforepegemiwaj.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rjr6n65nthi7l2vig3j57vs0s7/68688617948.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6bcc7a705---xerosetezaxujaxugixub.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7d09039d---jupisubepifewobopiziz.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb530dde5af---153806686.pdf
    • http://shosholoza.de/file/20230941815.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6a9afee08587f30788a8c7e2ebffcb80/nimurenoletesolalix.pdf
    • http://pileshoppen.dk/userfiles/file/bojujotupilowojisosadalod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=comparing+and+contrasting+worksheets+3rd+grade
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eddd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 16792 bytes
font_01_sfnt_off000105ee.bin
9c93f93f02218c533bb1025c2342250556f0f5d06a48234c6dfb02d6db3f0c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 16536 bytes
font_02_sfnt_off00011cf4.bin
d08a61e530d21408be84a5f176eb5f6eac4f420b00c0a81b329ace970f58679c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 11296 bytes
font_03_sfnt_off00013734.bin
a426e52c9d9af5dfb6100245aa5effce6750234200da3081fcf4ac23a9f0f640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13734 17708 bytes

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