Malicious PDF — malware analysis report

Static analysis result for SHA-256 3661bc8a207465dd…

MALICIOUS

PDF

84.1 KB Created: 2021-07-07 15:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d043e22224f8a5a240aebc1960beb4a0 SHA-1: 5b77f156823f067583e7fadb4b88d0df808f533d SHA-256: 3661bc8a207465dd1207c24162ad24912d17ad9dea4953fd47bda862026908a3
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links are likely designed to redirect users to malicious or phishing content, serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1aa56b97d---18300853038.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a430d4e72cc---wubopapivuruwak.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/zikurinovekeroxowe.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e200240d6---xefelebe.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0jcmr41o9v0io6au9bhi2kqd62/31905491420.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/m4i2ibvr0pc034p7l7sre17o8a/sidomadirekaxasufonipiku.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/in4ucr38h5epas7j4c1us3stpk/23410286973.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0f013c4552202344028d34af709042d1/nofesapoxajotekutilat.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd705669cbf---80629759655.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/13737900363.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dce4c35f5e---jopiwepafijororojewover.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/53319063800.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/rufofatomuwo.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/bcdb86013cacd9976298817b9bb35ec0/82966654191.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160902cea0828e---12699773522.pdfIn PDF document text
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/pibibonemaziruw.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/ziriliw.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92cc304f4b---tenotepitudegapejamumere.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/94982154965.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/64164373767.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a52b06bd9---59383502460.pdfIn PDF document text
    • http://ahchala.com/img/file/17067186809.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/madaj.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/68422544850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chat+issue+47+answersPDF 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_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 10384 bytes
SHA-256: c442c0011dfb832c65e09455134d41e566681f198f87b422e85d69d882b6d589
font_02_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 17720 bytes
SHA-256: ef484f5d9206b31749f518c7d8b39c9815b8ce19120dc685d5ce866847ae6b94