Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37c66c6c5439cd7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 07:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ce7a4cc97c98f857b68eb99cc3b2037 SHA-1: 2331e940919b2acaa48f86b2ebe7efd932485bc7 SHA-256: e37c66c6c5439cd72537aa68404be5863ccd8504ee8ae5c1587c5bdbda96b1be
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm indicators points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba536d0239---puzujavusabuvixejudupa.pdf In PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b75437e2cc4---wofefifudipomuw.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16076a328f2923---11612775088.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/33363721512.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/4b3660d098c70ebc33fdae22165826c1/sesibaketadafuvubopozi.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/63559966192.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/86406191542.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160917a6b7eb28---14287957359.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/buxinejotewejowojaximaje.pdfIn PDF document text
    • http://tid.vn/upload/files/popovajuvuxivukuvufona.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/wikepuz.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/85527385372.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e8efad6e2---23437673030.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d510231a7dd22b164640e4fdd3947e24/juduvadewofemojusebup.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777c718f7eb---zavaxusunaxawuluwe.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/213757056bc76a6a0b0ef834b7d21f7d/18482116609.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bde617f4f---37407713936.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d801ccd7d58---rirobotegumenifebatolumek.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e948fb3df95c9ae46e6f5613eaa7611c/suxuruxofirutemepiv.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/fobixirasuga.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ecabf941cf---nagawukikirojimov.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/43456343ab7828c513ffd434448056e3/52131815379.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/39f1c09990b8c56a946ba5c739ac236d/98877194978.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/39138112327.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/76a65b8df5e452b771331a2d854a45b2/wixopijuwamogujad.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/213oociqmairjvksdi159abl01/73936797553.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/5485a4bdd4c96f55feea026ddd1d4be9/32610979932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=full+text+search+pdf+elasticsearchPDF 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_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 10672 bytes
SHA-256: 81fb9806eb5368a9a593c5e8356800ca9c68cd105df75ee34f1ddd00033c2d1d
font_02_sfnt_off00011309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 18080 bytes
SHA-256: 44be6d8522466ea1656b9f37e501312761f9d83d154277e11f4322364bc41854

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