Malicious PDF — malware analysis report

Static analysis result for SHA-256 abefd428e61be146…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 07:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2800bb01e9053ecdf48320241114f3fb SHA-1: c7cb198f42c50d138b6a7560f24c58f8cf0ac99d SHA-256: abefd428e61be1460338fbd7e24169d5d7cf401de60c0dfd5467912af4275cc0
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 indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=android+health+check', are likely used to redirect users to malicious sites.

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://coretry.ru/uplcv?utm_term=android+health+check PDF link annotation
    • http://nickels.design/ckfinder/userfiles/files/29121766019.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/vutolik.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/11450013242.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/5491806161.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/52193952422.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/lojogitatopubeneme.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161467e0d9b0b2---femupuwetipiwil.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/mapikufedenisefosojij.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/mawag.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/35289279578.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/63466214080.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109080914513174.pdfIn PDF document text
    • https://penzion-palice.cz/content/mojatinutibidebeletadi.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/89045960547.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e8d0691f---93009311846.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/06ge05l8r5fuodpo2d5vctvrgi/zelogufijumazezazetomu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hdddqdeev9qem4uangqhq0a4gr/50652854151.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161349d775d151---vigetogutoresina.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/47198096492.pdfIn PDF document text
    • https://protum.se/file/31592979061.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/85234770080.pdfIn PDF document text
    • http://webs123.com/userfiles/file/fogetat.pdfIn PDF document text
    • http://videlec.be/ressource/file/sulekekovoginuvelixa.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_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 16672 bytes
SHA-256: 9fba6b765329426712dba9cf03d2f946c36c99e902abfc7e0374673e552535d8
font_02_sfnt_off00012128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12128 10372 bytes
SHA-256: f6f5981dc599cc3ed4bebf8dd57bf0648923f29cb2df43d10231cd1f0b298b86

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