Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e26687d557f3579…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 10:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: caa290c4cae8a7bcd28ad51b4b06fcd0 SHA-1: 38eade22428023903d5ec448afcec56930e6f3b8 SHA-256: 9e26687d557f3579506386580f786b118f39d2faf1a744aa13c42c6008a1bdc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.elmundodelapiscina.com/ckfinder/userfiles/files/80211741266.pdf In PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2a527820f93d5994e9e45edb8fdabd90/21715878980.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/zifusofof.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/faa2a4410d85c9a9ba33488be0f112a6/kosidiziredebipugefapolun.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/60079767797.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9b579d179ff7b024db0424a4a6686efa/91038026299.pdfIn PDF document text
    • https://wagaskar.com/media/xusopepikosoxa.pdfIn PDF document text
    • http://hkalc.com/userfiles/59949543922.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/morupegetuvatopimukudev.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/gmfurk4r3e84k25ss4fgaskecn/nibopu.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/6655691583.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b73b1e994cc---51070746571.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/xaxifijidolikaviriwal.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/31396953494.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/15760923315.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/41971809104.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6b5225a0a---jubipelikukemesodubol.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/43118362987.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/18025846732.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/41965285749.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kpt9ffarc3bhqh409rfvdod2bs/rekijuzigalufediwifesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=peugeot+partner+2012+instrukcja+obs%C5%82ugi+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_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 17976 bytes
SHA-256: 3a47b4c8d2745cdaca051c57e5222ac12974cfcf74d2c0ec0d30f9d9c8eef899
font_01_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 11576 bytes
SHA-256: 0044549da4e48e2383e3a11008670a078940283c0353c2fcc0374c25845b4ad7
font_02_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1