Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d911b6f7095182d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 09:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f158d42e2b1cb47a921858f1d0c338e8 SHA-1: a9d2da857e65e62f34c9273d534864aacf9157b1 SHA-256: 3d911b6f7095182d8ffdd8333aceb1513c877e17a374dc40d22e045f053137c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

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 http://stphilomenaonline.org/userfiles/file/rotatabusurajizegir.pdf In PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a837496c0e---70352834435.pdfIn PDF document text
    • http://gibisch.com/files/files/xaburoxedolaxa.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/woberiv.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/17670138077.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/xatujolinodosijozerufugi.pdfIn PDF document text
    • http://charontrade.hu/data/file/30430268890.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/lulepabem.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/92361231054.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/faxigojikafe.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/52288819063.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161099f129ca07---87019324080.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce02d000b1---17470841643.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f95a0868bbfd3f9f81b4169aac76eebd/32968984362.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/59946868532.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f81806e7---xavidokatepo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8d1a9aa622---bijuzutosokogev.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/tisuralemipajaxuparositus.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/wogonipidowopameboboxuxa.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/77282133194.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/40542847342.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160927c88769fa---94053878088.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/49e5a07663cbedcdd846655eee0ba50d/sodovetep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=download+program+converter+word+ke+pdf+gratisPDF 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_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 11208 bytes
SHA-256: c262263eda62cabd89a1c5afa84da2391042e0dee077d97e5053bfb92402eb4a
font_01_sfnt_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 17932 bytes
SHA-256: 99260ac8c7ee76fe9a0c883b013f84c2f75e7c069c943bee7fa8a74ad4fd0adc
font_02_sfnt_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1