Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1daeced08779e3…

MALICIOUS

PDF

143.8 KB Created: 2021-07-24 03:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40d7c9e89f2497385bbe549b6226284d SHA-1: ade5e5b108ee2ee5fd15e7079351ed8f7ef92e43 SHA-256: 9f1daeced08779e33e68c38063f7c32ef580d33e373db87ee3b4eaaf3f71fdeb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are designed to lure users to potentially malicious content, classifying it as a link farm. The ML classifier strongly indicated maliciousness, and the heuristic firings support the link farm and compromised CMS upload link detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/dtarfbpucte2eqafa4mqbg1jlt/xawazewiwumekonididolep.pdf In PDF document text
    • http://mistral-paints.cz/userfiles/files/megugexofijoje.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c3db80c5b---pedupetiwozimanaxizal.pdfIn PDF document text
    • https://avenue102.com/uploads/file/jujinakikorewegiral.pdfIn PDF document text
    • http://geoman.cz/data/file/76174952580.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/dotagiwuxe.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d973d2d729---piguxav.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/48031819385.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/49411768887.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/25411468003.pdfIn PDF document text
    • https://airbays.com/userfiles/file/81758881152.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/wunirinojeforinafe.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ftqo5m8ndjvvue2o3eoo79kn4q/tidasedu.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/dojanerij.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/3l47t3os4fga2b3sev40m1h3mo/11398842452.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rl2j9ft5sa5ca7t3v7fmtqchf6/varamotirutezavovavubirer.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/qa7qgcn7m8gb50ik4lsol8nrv5/bigevejebo.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/rakelasujavusukovasub.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/93191439504.pdfIn PDF document text
    • http://vo23.ru/upload/file/5313006467.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a46f131c653bc856df0a3414d81820b2/tulilajiwajetadurigalunor.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6np87jgmrapj41uvgdi36kqrp4/36347024008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=reading+plus+answers+level+l+the+great+dyingPDF link annotation
    • https://lapdonline.org/file/63516585989.pdfIn PDF document text
    • 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_off0001cdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDCB 19484 bytes
SHA-256: 10592a4120ff961b065f20e8d5619f8d40fddf7c315c314c75a5efb5c31a4b96
font_01_sfnt_off0002005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2005C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21873 10960 bytes
SHA-256: 6460c2459af8430861611946c64a539b5a73ebe0a99b57c5c0ce0b7a79c11c54