Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecad35394b1fddf3…

MALICIOUS

PDF

94.9 KB Created: 2021-09-04 22:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4c754f24e7e7e31dbb425f782094cf0 SHA-1: d398a922bbeee820783bc8b2a5d2f2854ad3081e SHA-256: ecad35394b1fddf39dacc0268df34008159d22f169930f01df1f8355e8f48f3b
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to leverage these sites for distribution or SEO manipulation. The presence of multiple external URIs and links to compromised CMS uploads strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m4oo41om6i9gau6mvbb7sloens/96650660528.pdf In PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/sixofabe.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/fem644agust39jeieuundtcg53/5611055032.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/vefevidovebimet.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qumlvvg9flh2f3emkah6vmn8m7/turudefaxi.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/tanugaxiloxekes.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716a093c7ff---46143736881.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/kegexoxe.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/15972179520.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/mjngvivfl91fcfl1stqnhmj7j3/nagenekanip.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114d632d4e31---lumukesafogokebasoleduzez.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/vijoleroreporajurixara.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/111850328236.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/95740376bd79b61ce7950378607f503d/34809297672.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/koretozobife.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/43262954126.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/31764409900.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082c97352a5f---38859317841.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/84895940576.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e16faf82756fcfd6954b87d728b62b3c/50212887661.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/63588189310.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/dufebiguwe.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce0c7eb70a---85472770249.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/1140451c97ae48e497c6dd9c0dd1027e/fugoterimosigeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sclerodermie+2017+pdfPDF 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_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 19508 bytes
SHA-256: f5b4f46b5699af2f6e9cc396e328804c5af9b00ff1672f66f89c16b627416bee
font_01_sfnt_off00013d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0A 10668 bytes
SHA-256: 7888b9031ab03b6f7ba1ffea3f695c7b88883d3a8cefe434a122eb9685bbd59c
font_02_sfnt_off00015592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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