Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08b92a2c216f382…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 11:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63f889458f138e756f286d8af48e2ea2 SHA-1: e16ff468bdc6bd5d721ac3579ec4ef99cc29ed23 SHA-256: a08b92a2c216f3820638d62efd53b683ae6c5ca36891f494450bd3b314181571
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is intended to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://stellarp.com/userfiles/files/jabugimuximewinaguvizepez.pdf In PDF document text
    • http://mystruggle.uk/indigo/ckfinder/userfiles/files/96209694243.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0afd928f7d---roterimosemeruribo.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/busoripekirelijibudob.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/38130361756.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/t3m43m7fkn7e0gfqip8j49la43/mupebuve.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/22839e0707eafb3737afd14dd663db04/fosivagumenadopovu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90d1702b2---nuxoxegu.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/98140695072.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123662695ee8---63949210822.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/rasiludewapobogamarujifo.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/jixitevunos.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/zozunapetute.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb1598289b---74143226191.pdfIn PDF document text
    • http://geotersrl.it/file/kudakotolerugukukulor.pdfIn PDF document text
    • http://iccarrentals.com/files/file/putefiwawejet.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/63458181784.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/wewunasijuziwexitopo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e8b000f5---18428784883.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/pijetetuvip.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/lebinavifi.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/fukodurunarikagolelawifi.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d0add44b---dozadev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=performance+measurement+framework+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_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 10924 bytes
SHA-256: 6099aa7d759c9a3db78230f3bdfd5aee7b527320118d200baaa9432b69434b94
font_02_sfnt_off00011466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11466 18472 bytes
SHA-256: 75469508d6ac99470ff40942ae744941af4a297152f53b813974fa4965796153

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