Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fe9b9eeb53be48…

MALICIOUS

PDF

73.7 KB Created: 2021-05-24 16:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7201b762083aa32339cd0836d83c3df7 SHA-1: 4a817fc3cd3f0d0141186cacbb93336a48a92a28 SHA-256: c6fe9b9eeb53be4849947115ddfbbb6e233ddd5e9b8d97765d4a49d1d9f7b613
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports the lure to download a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9e0ce0778c0697d04002b26de0b973cd/81941846973.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/3a55576c227875e46a2b9a0eb585d612/22251199176.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ae1cb8875e3551a66d744b2331051855/jabozudodulalalamasibufi.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745699b408a---99378213381.pdf
    • http://atol-res.pl/uploads/file/rekarutofogif.pdf
    • http://lorichphoto.com/pictures/file/dovatew.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f9ef5e7fe---29770445664.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca5b86996d---sokexananoxonasokuwos.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/fba35853e0919623c9114b5f16da6e61/xepebifum.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/843972e3b9e101b522790b52cdc305b7/18014187125.pdf
    • https://menlopark.com/wysiwygfiles/file/7807862262.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/eb3497ffaf39c1534817ab84cc4c1d53/gokexanipokapexivunoki.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087234562ce8---dorabobo.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce34cca567---bexis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=export+large+excel+table+to+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e470.bin
fae16c0f4f2101cecab9eb7ecf0f5f9f32a486e6e13e2ea93b15a0855eba8d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 5312 bytes
font_01_sfnt_off0000f694.bin
66509da4fcab143de8510ebdfce6db0174341581ae8fea735667c1299826e7f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 10376 bytes

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