Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d568e2d95d08ece…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 06:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 26b52e5a4e864c3f9420d0eab5ece83e SHA-1: 1be1f924f2348076f4dd4cef83f6016dd5155bda SHA-256: 6d568e2d95d08ecef20d38a968be8cb934b62809ec0b3ddf1e6d2bd42c2f33c0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.slenderclub.cz/ckfinder/userfiles/files/kekibivejavokana.pdf In PDF document text
    • http://bularz-auto.pl/images/userfiles/file/suwajimegujolabowifa.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/66436054f183cadd11c647e4cd7b594f/nimizevasigepakasawize.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/77397749068.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/retirururozopetote.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/s89cong7ebeuiq94ol4f9eh25k/ralefefijatoxukug.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-8-20/20210820221002545641.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607864c78c03f---gibafiroxifug.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078fdef06a4e---jevikatademafuduwuxu.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/zizagax.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/mibabixokomelakerurogejik.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/68245075318.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/75558600033.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1cdc3380---32381903009.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/86099462089.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/504d61b75effd05fe13823ace956df96/nedukivevozorufopejeno.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3lni9ehmdc9eugjl9g2e677a06/41719681643.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/jisiwowiwujemiwoworove.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kelewemunowufajadexe.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/45597289168.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/36240106410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mahouka+koukou+no+rettousei+volume+29+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_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 18216 bytes
SHA-256: 1f0dc617611979df927cc4771389dbd648973e3aac53471533c09a17c2a7209a
font_02_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 11304 bytes
SHA-256: 1d564e08348e44dd692e59f22964025011f652fcb366f730726b8a7123f690ed

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