Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ec68b5454503d7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 08:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84bddab338203c0132e8bae05e3de8cd SHA-1: b4502a2a38db3d6a56173efc7a4d82c3c880126b SHA-256: 25ec68b5454503d7c4c820e0d9ee9eeae99482378c201970cccfa87ed778349c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/cab27611424e32c7a112171438756e96/81605488726.pdf In PDF document text
    • http://liebherr-tr.com/userfiles/file/78571723701.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/gotunu.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160908fdf2d364---vudowiloxivi.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/sizalivumoni.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd8885fcb9---baxepizadamodubavixito.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/68089215129.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/jq1h8jpk4uiiol436auv0krl20/82339343681.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/27330665980.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/gamilexabogewofibamovifet.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf61756863---busenoperesokiji.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cc9f60145---xeratuniloju.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/b57ec24dd3351a14daf44a287dd6fe4c/nodilifaludusabobaga.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/fufaxolaxusimubomalugusi.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/noveviratefim.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/xivomozana.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/48588449571.pdfIn PDF document text
    • https://loyd.rs/images/file/75356582640.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/tikumawabaluzegolawavi.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/vexizaxotezajibat.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/rnld98pppcrfapq2r3lrj2e6dc/17589436130.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/siwilukowavusagokogu.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/risurututinusadekagaxatut.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lok3rugfahhchr7fe9ikadmjil/62866819227.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085513ee3545---74185620639.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff797c697---kovewiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=reduce+size+of+pdf+file+ubuntuPDF 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_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 18128 bytes
SHA-256: 8816bf40fadd6898aab523ba5fdbbcd4df8c565b031b7f65f4391b1171057309
font_02_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 10696 bytes
SHA-256: c9560a49adc741ec7cd9b2202e4b4a5e25d7afe236634fee2d9a824b7bac4f1e

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