Malicious PDF — malware analysis report

Static analysis result for SHA-256 f714a432b54283d6…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 15:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b14b6fb6ea95d6935cadb316df942a6 SHA-1: 21a5f780e39208fc9566b332892539e9b68c59bb SHA-256: f714a432b54283d67aa5dea9ba634690d112a464d94cf3268586fdf147b4d543
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous links to potentially compromised or disposable hosting sites. The PDF structure suggests it functions as a link farm, likely intended to redirect users to malicious content or phishing pages. While no scripts were directly extracted, the PDF's nature and the presence of external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://symbioticlifetech.org/attfile/fckimg/file///2021070719114_727855745.pdf In PDF document text
    • http://foto-recepty.sk/images/fotky/kuwusokof.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/26633131996.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/61354112039.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/bupekuzutun.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/suwakebusa.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/60415603447.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6162e4f8c---65363318798.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bf4549ec3---ziwolerevamavine.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/38487177383.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/47749497006.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/dogewoluxusufovipif.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4er6c6elmvs6qmn2r82k6lt1q5/83431629478.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16123785ccc314---suwesu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc63de7337---61727431188.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/lelizegag.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/fdae862257e51ea9016165ac69c4e9ce/delajaged.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a1f5a82e.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/27000161438.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffda0bee86---kupetasizodivukevixamada.pdfIn PDF document text
    • http://change4best.ru/upload/file/27513058689.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/88044911878.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/6121016666.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a407c88ba8f---wotabopavovofepajimopago.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/88562211329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=glasgow+city+centre+map+pdfPDF 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_off0000c07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07F 17296 bytes
SHA-256: 20dd75f22baa19cc0c573c72e87e7afbfb5d07cc7abfc17141b01a5061103235
font_01_sfnt_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 11204 bytes
SHA-256: c7261821b236e9795919c7fb15636e1bd0aca8b84154f4d32e69d8758f603b75
font_02_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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