Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e47692aac38344…

MALICIOUS

PDF

80.8 KB Created: 2021-07-03 15:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8d6b1fe589798f38f6eec00c8d75c98d SHA-1: eebdca6bc4276d85ff4973ab46b54fbdfe255a5d SHA-256: f3e47692aac38344a07c1fb4db13aca5db0e747410c12e4a6a64c1950594808d
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of multiple external links hosted on potentially compromised infrastructure suggests a mechanism for redirecting users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/cf5531a09c5a7f8b321ee09068978e57/60539185094.pdf In PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4e587b68796b69a1da148ab90d88180c/bulazupuma.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/755d7530dcf69b5e49543fd341e61090/3409791078.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/51383310487.pdfIn PDF document text
    • http://gtshotel.it/images/file/9451449713.pdfIn PDF document text
    • https://avela.md/userfiles/file/makor.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nco455caa98709oseim6rtalr2/69709946372.pdfIn PDF document text
    • http://promador.pl/userfiles/file/73860555524.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/wexakelodifi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a9b1628fb---gugave.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f2ab74289---wibanasigivo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/965a42a54d10953e6ecfa5007823055f/mefav.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/g1b7vbj0g1s2ob12ja6b0potps/perazuzib.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vewixeworabuza.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5a107kgae6455l1ejj6gtbbpr6/1490487523.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/57017586495.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c689af84597c4e9e297c2914a33bbd41/wanafe.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/funetitedejuja.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b21fbgseonvidqqo53e54ufk70/11763098090.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec59b65cde---lupukuzepizodido.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cd80c83f1c6---16208863152.pdfIn PDF document text
    • https://zold-kommando.hu/files/88047646049.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bcf8c2b1a---37912321981.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/34595dd2235984fb1b2f1a0073da9761/lewuxid.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086380ed3cbf---51550264337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kinetic+and+potential+energy+worksheet+for+middle+school+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_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 17072 bytes
SHA-256: b076221666858b8f5f0dafb343aab24419e464635184f7a07c2d3634e1805dda
font_01_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 11352 bytes
SHA-256: 41cc5647f79cbbd36a73351f32b7d3aee67596e09c678f7700c29a23a79a7383
font_02_sfnt_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1