Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe413c000a512a0…

MALICIOUS

PDF

98.5 KB Created: 2021-07-21 00:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c834db825c7affad49cde1141b673c5b SHA-1: d6d3994a2257032f48a617369c9bc42310e0e313 SHA-256: fbe413c000a512a005888622fb43e8f57868fad1e85f4b214cb732c4e7403d68
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while numerous, do not directly indicate a specific malware family.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://yourbuilding.ru/userfiles/files/33787096142.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1f603e6ec---vavivudadesejefokowef.pdfIn PDF document text
    • http://pk.mo/userfiles/file/54911470564.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/97289545495.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/73140807568.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e146e613b0---kuxoburebekedono.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/viseb.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/82072904507.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884dc36da6e---mixexuzopapigarexo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef0e5b4a21---sazemag.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5d1eb08fe0c20e1a55fe0635171418e4/savulolowenowebuviredojiw.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/174623871160f34979ce839.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/tafopotasorudin.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7e0aa7184---14582277226.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430025930853575.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/7a218e7ebd2f5e98f166c39e136ad48b/18540228811.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/riwipogeworazel.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/31027753244.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebfc11d41---kukezi.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/23861272536.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/31147340733.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/4b76a60705e5a47be11d06d12292bae9/dunuzopewulovuxu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7cd6f99f---vofokekesevivalufosujod.pdfIn PDF document text
    • http://petrduchek.com/files/26496528164.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160931cb3b484c---69558351142.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/kuziriruluwux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bayesian+joint+probabilityPDF 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_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 10684 bytes
SHA-256: 4dca23176b1d53c10ff59a1d077f72487844f4710448f3844f3f63dfcf4b0079
font_01_sfnt_off0001360e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360E 17680 bytes
SHA-256: 32991f23c2752a0e9f54de113efa9cbdaf4f017de060e9c6436ba8a079248495
font_02_sfnt_off00016487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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