Malicious PDF — malware analysis report

Static analysis result for SHA-256 c071d4b309ceea6b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 16:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66cdb50ad78de24790db784717c69937 SHA-1: f99ccbb44003a83f1eb1c21b38553439a0428e8f SHA-256: c071d4b309ceea6be73b6125cdc95fc7238882f124fe359a2621fce97cba89dd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as https://medvor.ru/uplcv?utm_term=boruto+latest+episode+manga, are likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://medvor.ru/uplcv?utm_term=boruto+latest+episode+manga PDF link annotation
    • http://kleinschadenexperte.de/userfiles/file/43137187256.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396167b5135---31603732415.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/zoguwuvaremegedasogizo.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/38441921781.pdfIn PDF document text
    • https://bdata.vn/upload/files/95247202012.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/29882022424.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/37844267467.pdfIn PDF document text
    • http://vititanon.com/user_img/files/67119302063.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/3423203744.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/zudezikoxarulezowemadege.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/65120475854.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614296415e342---getopijaravitigid.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6fguln40ao00i6fleo7crhpsmc/45056374573.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/pinowemafodi.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/lunogonunusiwez.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/261168384.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/wotodupu.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/nomodiradafu.pdfIn PDF document text
    • http://clingac.com/d/files/dakuk.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/bizobejupaxevozug.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a9a4cd5740a57fa89bd2780be5403f92/gonituk.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/ximujadow.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210913_161706.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/mozavowenagedubutudi.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/lobemadixunejaletelike.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea04c5a99c---17547110738.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_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 10888 bytes
SHA-256: df8358245bed577f7ebef7599fef55704d64b3ab018d84750cff3487ce864bb4
font_01_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 18784 bytes
SHA-256: 90b6fe0b85b633d9faca635f8226aaa3d3d4b537f118bb52f0ae2ae05f94a64f
font_02_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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