Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8ebb1054cf71a6…

MALICIOUS

PDF

115.5 KB Created: 2021-09-02 05:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 134ed14de3e6c94692760a75f2e5b0b1 SHA-1: 83ef75dcee58f30f9cea2b59a586c3f264e96a01 SHA-256: bf8ebb1054cf71a6f4bd155768c19a6769913c753d6828b91a20054031776db5
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9771

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://sunriverps.com/data/editor/file/pojinuxiropinodawanoxubu.pdf In PDF document text
    • http://aytekinpolatel.com/image/files/bukovibusozenukaduz.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/nsrhi35m0u9ktonmauc87l93br/furimukodugasor.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/57296505804.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070ebb0afcf1---14043573335.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76704800c---tupugivijuxesopiwimige.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/baxusuxevugilokobivuzudo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ef007b63---davomidunirevipowoxu.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/11710251799.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/80430838676.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/38994527918.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ac66e422231dad2dc1ea200c4473734c/281551247.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/34619396038.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1d50c5656---75653774044.pdfIn PDF document text
    • https://baongochoa.com/upload/file/16746519165.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160924d6160a58---siputigixukusutedilipi.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/degekudulatudugop.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c60c9c309---xumanipagudogoveri.pdfIn PDF document text
    • http://iltorg.ru/upload/file/jupofesidusulabu.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/redizedizogumam.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e352a44761b---7169782766.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3b96706faaa28164f25abf89cf96d2fe/xopaxotepatil.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607254152e9dc---geratel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gray+wolf+life+cyclePDF 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_off00015c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C96 19696 bytes
SHA-256: d915b11622d8042dbec4bcba787bc5f3c9daa58aa94378574759c7e7b293394f
font_01_sfnt_off00018fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FEF 10196 bytes
SHA-256: 9a122287c74253b3e0f72e7c2530286603b599e0d118c33662dee04b85040983
font_02_sfnt_off0001a6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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