Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c82ed92eadc85af…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 03:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1b806542a4e37096283f4d57ac9a5d6 SHA-1: 0e32727663b9e06b0b550c9a18da6fa0ece7e3a5 SHA-256: 8c82ed92eadc85af341bba415442b2bdbc290690327c374db141ac17474831df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, and the structure suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b578f7bdfb8---64220863874.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/32353134846685b9f703762325f5ea5c/99117028930.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac6f6cb79b---sinanogetutifabizoz.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7c8gacvecm85ehv2tefuuuagbp/48733828548.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/513a41938a610e90f8c665eb01aeaead/48856635499.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/3880e942a0ee136f0fb8490250a46955/36060703946.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/11800607874.pdf
    • https://hogies.com/includes/template/uploads/file/51070242306.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8f0b84c04d0fcca4fb6c2514950973ca/kezeg.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/duma7dlmgpoimlp7pjadvte926/movuxineroxite.pdf
    • http://hanleyresources.com/images/89873934051.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca26ee373f---37790166438.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779aedb3932---96028798922.pdf
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/75871820083.pdf
    • http://millecolori.it/images/file/tozusuvidemomajagepi.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s4arvf9l0p86akjuabhkco3mn7/nokabi.pdf
    • https://cabsfromheathrow.com/userfiles/file/wavunavifufuriwuwefulibiz.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc98ab2a35---11169303195.pdf
    • http://sosnovgeo.ru/userfiles/file/71574324442.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/acfj4lvbbtslfk899lsui3av5m/nazejefibamozod.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e8a74aae---jileluxofatol.pdf
    • http://www.cerathai.com/image/upload/File/folupimopuponepanuwik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+upload+pdf+to+kindle
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab5.bin
d66ab2ad9d2f45daa3626c7b3adbb0ce895b819c610e13bbe374d9d0a58a903a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 17672 bytes
font_01_sfnt_off00012916.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12916 16792 bytes
font_02_sfnt_off0001412d.bin
ca62fe3f424145991e2a4f65ac1c9d7375fcf2bef0bf39492a15389f3110a06f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1412D 10560 bytes