Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0c440f4e81df31…

MALICIOUS

PDF

69.2 KB Created: 2021-09-15 14:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d447f520dbb09719460da25050a492e3 SHA-1: be178ae0bb58710daf162d2cfbfa0186996719cb SHA-256: 8a0c440f4e81df3194ec094dc09982befbd214158758f64db9ce71f701b2a989
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The PDF contains numerous embedded URLs, suggesting it is designed to redirect users to external, potentially malicious, sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://agriplan-rs.com/dados/ckfinder/files/xanomej.pdf In PDF document text
    • http://hoanhaochemical.com/uploads/files/38510642432.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/62614179084.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/19911884271.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613831d31dd3b---posus.pdfIn PDF document text
    • http://zzquansu.cn/d/files/matexolijagusakix.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/73122591661.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/vifevulazilifomon.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8b87fc07b48a03504ce61b30922ab0ca/81363561114.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/78636109576.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210902042752_vgj48b.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320e67cd9a7---28453120560.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/88757305029.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/tafutafuw.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/remonejitepusobodikugu.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/jisonepujudujisif.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/30136011925.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/89413164073.pdfIn PDF document text
    • http://rjt1.org/upload/files/fasotamen.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/rutumokojipotuvoxada.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6cbb47067---zujunuzonemug.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/51847376311.pdfIn PDF document text
    • http://topstec.com/d/files/gapufifujepajizimiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=do+you+speak+englishPDF 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_off0000b091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB091 10640 bytes
SHA-256: a04607855e9793d142ecba9c8c6b6290de9a9e46512c905b3fa516c93af77c10
font_01_sfnt_off0000c8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DD 15116 bytes
SHA-256: 90995fa490e3cd76d668656285d63fb2e8dc37fcd58f7ce65d5d453574596f83
font_02_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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