Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77d2cd85823a12e…

MALICIOUS

PDF

89.1 KB Created: 2021-07-14 00:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8f6d3afaee6f5631af6266c01c039ede SHA-1: 214a694d46c9f7f409b668a9974aaccc46fe53e4 SHA-256: b77d2cd85823a12e35139788fdca271b93da10e79cf36d96d26a517e897917d4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://huntic.ru/uplcv?utm_term=chicago+style+footnotes+guide PDF link annotation
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/br0u8f8uhofb4ktp505q8r6oum/81430608628.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1625684393.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jenejlo97i7dsl95diei2otnca/79214604839.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bd592f3d8f4443f69ab286d5961d9fbc/jegawexatonekuwologujuvi.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/wufotabunebamafegugop.pdfIn PDF document text
    • https://latework.cz/soubory/mapebekat.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a885c15ad89---68877335877.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c885f0a3613---90522744899.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/14837373079.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/c0pvrk8i1mfmnpa7soo562mjj6/kasifofazavogakulaluguj.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/kuxevetilifelirunakebom.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982fcbd35ab---16766793196.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83e7e17b2---91268749132.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc9fea872---55631849686.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c681c7f18be---napunepipid.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/81e537b010c059cda85e5577a3015a11/rumafavoxaberi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8fce17d9d---90280334090.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/agbm9arq48n6s4q6domotjl4c6/givoja.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/bepekide.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a627b096ded973cfd6d3a689b358bdcc/keraxotovitumemaz.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/kolatuzuzobozewinafide.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/pilowuwijez.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4980f0374bfdc2499e2d1a24ee8e46d0/57792187617.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_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001117a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117A 10900 bytes
SHA-256: b31b6adc8aadf779ff278db3e25d7e122fd33b31574410edc8a27914e049ec4a
font_02_sfnt_off00012a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A89 17044 bytes
SHA-256: 3b672d54bf8179d4bcfbe2a0af18f5e722b13d729b85450dbd1649b5f8050da2

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