Malicious PDF — malware analysis report

Static analysis result for SHA-256 65020d5d3c4e00f9…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 19:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8de2182d68e5e970842dfdd33ec3c74d SHA-1: dfc5fcfe0003e6a8f33680963b7418c3a8acfb79 SHA-256: 65020d5d3c4e00f94e7e0eee6a89fba2d3e34efd996b0c2cafd7e75e1e1cd636
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 WordPress uploads and disposable hosting, suggesting a phishing or scam campaign. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=subordinating+and+correlative+conjunctions+worksheets PDF link annotation
    • https://shreenathtechnologies.com/userfiles/file/wadudenezisij.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/fd940bf72b9d1709ea06d5fd2d6aa75e/zuguk.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d50e76b82---52459462818.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/rarulam.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/36599196543.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/14074327143.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/98761660778.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f14d744c702---33365156772.pdfIn PDF document text
    • https://italvaping.com/file/peleburuxevipezilun.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608155e465473---nufakaxovibutawezifi.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/9360091910.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hpf0v9huru680iei97ma3feirt/63481548472.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/51850801640.pdfIn PDF document text
    • https://kapefashion.com/files/files/guketisu.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/58489069789.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb3d7a07b---rakur.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/75403970433.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/xawinixifitifinus.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608311b18cd65---28552740783.pdfIn PDF document text
    • https://aokman-drive.com/d/files/59193908101.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/tuvekunetadigubax.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/xidog.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c719da8a36---koxawunujatetabilurejoso.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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 11340 bytes
SHA-256: b57ba62903c910fc36356ff5e604c226793320a4ebceca58b18253acaaef5f88
font_02_sfnt_off00010ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 17964 bytes
SHA-256: b859a70dbe4a941e7124367ba8a753326fa0d3c89ef4ed3cac6ed6409842cda4

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