Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d25de193e3c2b7a…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 04:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cc9681facc454a2cf72934376a506d8 SHA-1: 4fb09979638549931015844545f6b72037ebe485 SHA-256: 9d25de193e3c2b7a20c7b22a2a809ee04d9cae6a018737e15367ac93267c38bf
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=galaxy+tab+s2+gsmarena PDF link annotation
    • http://tz5168.com/uploadfile/image/2021/09/01/file/20210901_072025_167.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2s3epsvu8shgki5rn0rou5he51/64851066148.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/13b2a7492debcb7ad607e7195f5057c9/zarerib.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece85970b7---72651581968.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/gomixavakosok.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/9826995651.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/koretulagukumole.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/dovomovepurijivodize.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/nasidokaxufadidexubojobuz.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/25fgilqp1kajlm9ku7blmv3rhi/9486376220.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161409c1757544---19183411784.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/826f7884447030364ced397f73f5208f/lotidotuzas.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/32098911745.pdfIn PDF document text
    • http://kvrhousing.com/uploads/20543729437.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/rovegikajezaginawuguga.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/sebonidusidi.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/81119883779.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/pegewilomejapope.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/94314790935.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/nikija.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/vopibuwuwutiwi.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/56361081824.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb69baff78---lexofofo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16133b53e45a17---dipapugodidikuzudobe.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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 10756 bytes
SHA-256: 32ae017f4bf1695386f723c296b5bc3fe07e4e966d88e7274bd88a6ba0553b48
font_01_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 19596 bytes
SHA-256: 8f21f8d47590e39f4fe945d4850a0d5c77499a9cbc84a316640519877efbeee6
font_02_sfnt_off000133ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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