Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc07969e2bd3334…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 22:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec60a90a5778e2bf88fd81d6cd2b7077 SHA-1: 482f780365727b38217adc09b7eb5fa6f73ff49f SHA-256: edc07969e2bd333441c3d614cf8b8b2b41354f55675aa3b774bbdd26c173aa00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/92169002077.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16086615876048---28524060058.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/jugirunanibozetuzebo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e64b9e71d574be2a67c45d61919cb026/36737451439.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39325800968.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/1266259709.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/93143765749.pdfIn PDF document text
    • https://led7.ru/file/sodunimulinuzetefotip.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ch69j7atl9g43nd2otf23h0qm1/navubalijepudaxepuk.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/futuvatusenuzutasopakito.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b71fdbbb49265302883f5d7fac700e2f/3081623372.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bad3bee3cd---wasalozatawazowak.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/9b4e1a08509ed5fc592ea85d961c9836/munebubipazefudajidifuvi.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/88196418404.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4fd0c94ff323ca7b75c5613959e06f74/pekamatagimizurawipebano.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/35286583836.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5dd22056---butowazexibi.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/59837729652.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/tefekufaveja.pdfIn PDF document text
    • http://garderoba.sk/images/_file/74471263492.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c00c2a4c4---90883440854.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/nodimujimixofamuwikinu.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/47117104427.pdfIn PDF document text
    • http://bdn10.cz/files/file/jaruxosukodufo.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/suxuzazusimo.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/jelokemewunodalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=philippine+propaganda+movement+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_off0000cae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE5 10844 bytes
SHA-256: bb2856888b301fcb13b48fec5ef99f4e191b86dc3aca2383f7aac0b363c68695
font_01_sfnt_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 17412 bytes
SHA-256: e298bed38c2ad0737a9227ee49829485332e8f1827e69bcd0b3ac2ee2a915fa7
font_02_sfnt_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1