Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa39624f00af2b48…

MALICIOUS

PDF

94.0 KB Created: 2021-07-02 15:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 968ff34fc6f2e11a2aa8b880f36e4705 SHA-1: 8ddfb69803b7e5a1cb1d9a403e825defe262f76b SHA-256: aa39624f00af2b4898ad572710460502a52a39b5d743e2c2aa61bdc744d81256
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress installations and other disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware delivery vehicle. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://crewmak.ru/uplcv?utm_term=1+year+study+plan+for+iit+jee+pdf PDF link annotation
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160783022573ee---dirase.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/26834660706.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/27346918315.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/sejafexuvofil.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e4f37f1e3e491c8768e7db84767e6410/ruzelage.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/7dpo99p8frej05aubm66djhnh6/31018740515.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8e1qbuadu9098pguga1o801b04/mogevuzaxoginog.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef82a2fc3d---95739344174.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/wutapunegekakozajiwu.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0207f32dc3de6e06085d629eec00c120/51597234968.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/39902907784.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070333039d1e---wifeguxofedunilidewo.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/156e6d1c518fc860f3d1bae81b3bdae5/744022763.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/fc1236803ae03408a4aa081cf904cc8e/13463081511.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/n47b87gvc2e2lcqu5lb9dttfp8/84285303180.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f292359f4---januragerasege.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/30119787585.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160882659391c8---fawumoxidopodolejogi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff756e98b4---vevot.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cfdd54d72---farinogigi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca6a703e4---sotimukisimeziwip.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/lekajikoluroxud.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/52037477038.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106300710.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/14643505910.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_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 10792 bytes
SHA-256: be522219b5dacf4243e216babe78188c8f56b99327c12658cf5d0d92930a008a
font_01_sfnt_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 17288 bytes
SHA-256: 1c3b1ca7230c587dfe60984ec45ace3e034962c9b21a91cfe75787f8690f8416
font_03_sfnt_off00013ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA3 17332 bytes
SHA-256: ab939b351528dd7f86bb3c3523c170435365d2c94d48b228e219aaafb4fc1941