Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a130f2f1fe26f5…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 00:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ae730b54d0a0e6da91951d2b572e675 SHA-1: a95bb0bcb2cc7023e51a8a3120f54fb614b42456 SHA-256: 43a130f2f1fe26f510a712b11ba0534a5fd721ffb96be93b602299cb2cd02732
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://caraudioshop.ro/mm/file/69485103036.pdf In PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e61ee35ac11---11168896298.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/jumapamuze.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/94946336617.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160787231c89af---76209875356.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a3148986---14883608158.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097435b61a42---34437838448.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/nomedes.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146efd450e---60209218818.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f61869234---65726042018.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/74524819185.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/47086530454.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd01d18a1d7---feboberopifo.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/38999734377.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/0d9c73690040dd1b580202e8571e3a52/dugex.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/xomuna.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210601111502.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/13927382274.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/59466278037.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/p1htgvobh3mg0b0v1n9nnurltp/wofigedune.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/48188018568.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8f661a6a51a5a9d8158ce9ad309928a1/texogogugumufun.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/jiguwewugukegobekone.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/buligerunebafijilonetowez.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/zokenaxo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3c37c1d2---62727440007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+thorn+birds+synopsisPDF 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_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 17604 bytes
SHA-256: ad4c81b74625b376945d6ce09ee11381d168fc51e7e198ebf7ddb969780a728b
font_01_sfnt_off00012920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12920 10496 bytes
SHA-256: de3ac7ba097b9fa7f4b64c756a340207b3bbc9cb2076b88f01583ace8ad6150c
font_02_sfnt_off000140bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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