Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a3d827b42e82c3…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 08:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf6eed7558a3df47f192d8df51ce8dcb SHA-1: f595d1c1eccb77576acfd7e11fee5eab3e75e689 SHA-256: 25a3d827b42e82c32839aa42c009aa3a3c5f115cb4fb1ae463ae89f0bebd7875
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate a likely intent to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ajtoablakcentrum.com/_user/file/14720001360.pdf In PDF document text
    • http://www.darvidproperty.com/news/file/sibasubigavamivikuviwovi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b4bfd4a1e27c1d343127baece7c3038b/12756365986.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/64284851957.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/mv2n7ld0hpam7lmo0smc6jdoo3/35952085447.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612b60ada4eeb---74710898879.pdfIn PDF document text
    • http://tw-go.org/files/84515774245.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/5475105029.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/pupefidowug.pdfIn PDF document text
    • https://path.mn/userfiles/files/dogabovigi.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/94342621775.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/ligugerelagerufavesuvobis.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/rovufetavukawomega.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/49040208747.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4719de01a---72568970417.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/gokidarapapakoxopakuteju.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2678e3ed30---ruroxawixate.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/79694879143.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5fcdae4fafeee07498a693c97efd2fcd/87648590105.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/muxozaj.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e4a8d980ef---15402267015.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3qtth8nmoe7qu6odd11if7e2c5/zurekosuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=definition+of+incontinencyPDF 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_off0000caaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 9968 bytes
SHA-256: 3fd31d6f3784b1f31fa5e3c62305753b7468439d15971f9f885b723890e668f1
font_01_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 15772 bytes
SHA-256: 168b70d3e49b6fbcd8b6582d2855068f05fa220f6516b983590eacb25aa1b26a
font_02_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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