Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9739bd89a70287…

MALICIOUS

PDF

89.8 KB Created: 2021-09-06 18:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b038820f400782ab3ec0cc1b68db3daf SHA-1: d5c39f6f99124f075e3ae92e6cbffd00fe8afdf5 SHA-256: bd9739bd89a702870d6cd80e006735d411fb4a84fc37a7f315806d7c01bb24ac
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites hosting other PDF files. This suggests the primary function is to act as a lure, directing users to potentially malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=the+driver%27s+seat+muriel+spark+free+pdf PDF link annotation
    • https://vico-real-estate.com/ckfinder/userfiles/files/30812915437.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/59589211782.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/56868016336.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/77c3cbbce7f93569f2aebe99c76a3bc9/32596577483.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/30121528277.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c027fc39c3---70682533704.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/27016363171.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16093a1695ad9f---zimepizobadefap.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b969c1ea616---kujirikuroxitufipanapido.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/netogi.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/tivuwovezegofanavak.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5c3e9f6a2---40599119131.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/paridovafademusi.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/bekaketuvotajewenemevoti.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/tedixebumaj.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/kudukinurafigebubujafaro.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e17e3809d---10237760641.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/sumegavule.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/kixewe.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/76162163160d2152be30e6.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/rolofaxotadiso.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f07c6e230---mugiv.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/34530719295.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/befbeaff4f31ca11bd9bdc59db589588/ruxutesafujunekolusib.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/wemeravagemob.pdfIn PDF document text
    • 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_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 10792 bytes
SHA-256: 0dc9f3e62da6b9be13596d0bc3cda566293a75aabe20afb9d5ef69e8b746cb71
font_02_sfnt_off000124c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C7 20244 bytes
SHA-256: 8e852457facc3c8e1dd2555779745b753761057fd1b863a73b590bfa79390130

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