Malicious PDF — malware analysis report

Static analysis result for SHA-256 931c712c5d67b960…

MALICIOUS

PDF

91.6 KB Created: 2021-09-02 03:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 142c43b9a3146bf413ebad1ef6e3669f SHA-1: 5c20bfde20884c038075b1c0db25f670b833f8a5 SHA-256: 931c712c5d67b960992c2a2d484b045c21f274e2e3ea72bb8b81ff3f52de8e0c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous links pointing to compromised WordPress sites. These sites host other PDF files, suggesting a phishing or malware distribution campaign. The presence of multiple links on disposable hosting and the use of UTM parameters indicate an attempt to create a link farm for SEO manipulation or to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609054f9953fe---sinol.pdf In PDF document text
    • http://szkolka-wiercioch.pl/files/file/fezez.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/541oukgd5kelrpf1pe60ta38ik/dizufovizumuxaworixox.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/48297983651.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612b37ddbcdfb---41683456988.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/65813777486.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb2e214a47---zowoful.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/lotetudugivuneju.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d805025ef3---94986357989.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/25935671205.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611792c49d6a9.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/8llioor1kb05i60et9t7p1f2h7/76688330786.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160886585338aa---12587493582.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/39479425082.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ck3ssn03mkr0h3n7pr5pn8m8f6/34684132853.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/e454b94d50805360348eae4afcf56adc/rigazazipakuvapufewaw.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/72920820268.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/serozuw.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/74b700b487f2a260640a41cf32f30ee4/38483624548.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/17132732845.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5b0a3a29fdb37c654e9fda28bb72622/58740503215.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/13087563857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=complications+of+coronary+angiographyPDF 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_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 10940 bytes
SHA-256: fd109063b33ba08199ea1c38bc0a2e6179c78034e6d010365316802a7045e63d
font_01_sfnt_off00011cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB7 16992 bytes
SHA-256: 28a5d110fbae829ef20f1fa5daa21270b65d4d8ca0fad58eba1bde041a4bf45a
font_02_sfnt_off0001489d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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