Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8b5fb7bae9da26…

MALICIOUS

PDF

89.9 KB Created: 2021-07-21 01:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f9a850ebe631ef1a49d5da8b32c8d92 SHA-1: fced22e407707d2cd5d6cc08a60207116b957a87 SHA-256: db8b5fb7bae9da26d33bcedba843befe77261b116e012c72c2ad389ccd415b4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e18d78abe97---vidiji.pdf In PDF document text
    • http://cdmatik.com/uploads/file/10926974478.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051520434373499.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160730ed1ae7aa---navoguzesemem.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086f16d4e13a---9311113332.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ba33ac81ac010b7943e3a86143c2e413/21428710736.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/36859418478.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/10589001245.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/fisigo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/71f67ad3d382d4dd5fdcb9bdd51176ab/90722600935.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/67658629623.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/saxuvubikosigaj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55c167669e---zuveme.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/jazamebaruxebatimarimev.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/59973319843.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/92960375945.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fbab46975c634a08ae4e930aeca7f963/58369809446.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcced6f49---7717445655.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lekomegupowe.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/rupitowazutuxaxekizefi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e9252393d---faxusejubag.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/seliwure.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/93592497360ae08862dca8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=enrique+and+coleenPDF link annotation
    • 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_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 17748 bytes
SHA-256: 3c18d66e394f734b30c7b9ed78ddc6bbb6796376d178365fee9e6dd07562ff5c
font_01_sfnt_off00012ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA9 10328 bytes
SHA-256: 420bb99486904161c05b5b79f5b3e2ee9963f7dc65beed105e44fdaa1997fe0b
font_02_sfnt_off000142ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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