Malicious PDF — malware analysis report

Static analysis result for SHA-256 273461f85091dcb7…

MALICIOUS

PDF

82.8 KB Created: 2021-08-19 23:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72d6f8fca2e525fc22158bd76efb854c SHA-1: 94e3930ae8dc7d7e8755f9c60bf6d46c61f353de SHA-256: 273461f85091dcb7c076f03453f1ff820aef3bd996ba40c4cdc9f1382884fd1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=smok+novo+user+manual+pdf PDF link annotation
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160876d2898cdf---radutapadozowofilakaka.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/02a193625a86bc1e55aa0d940165376d/fasipubewerozajut.pdfIn PDF document text
    • http://yjccnc.com/upload/files/98423921000.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/91096060878.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a4232a691---duvabenixelatutuvemadoma.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/33714d3e0b7c743488a2b060ae4328e3/8570109670.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e47800ab---wonadutujodo.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/28659765914.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/578560927018f395d05f65cf5dcf37f0/zofovepudesa.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609095515c429---pakafiwopijilupegurevorav.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c464178a4e---29889098246.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/dipuxawe.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/vutosatumikutu.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/natokedopirogeverexotek.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/862a6732729c6d07d245cd2d5ca92910/17449009104.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/mivoxexozobuwuwulewagur.pdfIn PDF document text
    • http://hotstamping.pl/files/file/14394455140.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117fe09df794---xupokorojipu.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/kowirakukaditoxineserekan.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/tiwulozazebexemofodip.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/rilatak.pdfIn PDF document text
    • http://skncn.com/u/files/ronevajumapewavut.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/41866345410.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 10800 bytes
SHA-256: b1723008e3b871338dc2ce7bdea0a06f1ec617ee00c928f489c9ba4b205184ae
font_02_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 17152 bytes
SHA-256: cf3b8db5d1baf478aced71f083307dbb7a8dd8da9e662d6d2c7a1c5b8f6877fa

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