Malicious PDF — malware analysis report

Static analysis result for SHA-256 896bc6246adc5378…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 13:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9107b16256c040f9cf83bf2e74689218 SHA-1: 690588dfeb33a58f4632724867ec8a6e34d9bbf5 SHA-256: 896bc6246adc53787a13ab3e76371e2f9b2ea9708629786ee5bf0e292b974a6f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=happy+soccer+physics PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kjkaphdm38nrderdncqr8u56u1/79058434416.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/revawujotinawomubule.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/vumumiju.pdfIn PDF document text
    • https://la-klamm.org/Files/files/99286403848.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/20701542108.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/4070915585.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353cc913b87---regutagajegulupuxigemivuj.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/53330500974.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/kasidikumu.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/mafexunazivu.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/nowupawivebu.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/munumujijevu.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210908120448.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/28598325700.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/xutesadivediwi.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/wesozis.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/81883738110.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/19969852816.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/wofenemaweladopuga.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/noluvagakavufufoma.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/walojiximavomegawuga.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/18380098895.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161440f6a15153---14693176472.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/kuzipawuzunujekinesi.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_off0000afbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBE 16228 bytes
SHA-256: 07139d61d330e55f1ba82b396ceb1a75b3cf0b00a65b674f386faf0d3d66d8f6
font_01_sfnt_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 10328 bytes
SHA-256: cc81d43824b7e2eb29c4548c790a95b6c84e8641cc432ba76e9fa81490d9fcf9
font_02_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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