Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a53a95aa9f8e93…

MALICIOUS

PDF

82.2 KB Created: 2021-08-19 00:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c481606d3180afe6a24a31e74a1a48f SHA-1: 1ec5feea146c479d5c90719bef514da7788c4eb4 SHA-256: c6a53a95aa9f8e931c48371f29c4e30fba54f45a37bfbe0d85bb59105a3ddf1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to compromised WordPress upload directories and other potentially malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the link farm and the detection suggest the PDF is intended to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9062470856---82729625109.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a560e673357---62203290411.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/77973778606.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/85295420517.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/33923483658.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/27090369667.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/45692409909.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/dovajikuximodopovekajiro.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f70bd6020---21637344313.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d3a5bf51d4d3020e9384789a360f9b1b/41078320213.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0433370665---damupemonuwezejixekosota.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/sukesujetelenorasabodev.pdfIn PDF document text
    • https://partner-support.net/user_data/userfiles/files/48337914865.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075af969aceb---mixomawusuraxutonetijew.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/2187738166.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/84221538744.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/zamiramijigadilatuwu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ed5372070cf18c57e012e277456409cc/keneteve.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/56745170471.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/35230449474.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/31553115417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+increase+iphone+11+ringtone+volumePDF 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_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 17172 bytes
SHA-256: dca35beb34405707bfdc92aef8b39d0c688baed9a3e2e5e28ab7fcbd19654463
font_01_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 11116 bytes
SHA-256: bf5468318e8ecdc36dd220c6cce4e742326a5911f02de2035b56fc4ec24ebe98
font_02_sfnt_off000122f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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