Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5d9047e5fa461a…

MALICIOUS

PDF

73.7 KB Created: 2021-09-20 09:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b9c4db0fd9db53b4d93b99d7dae06a1 SHA-1: 8651ab985bc79498819e2f4586c87600199d61a6 SHA-256: 9e5d9047e5fa461af38de4ee2782c50a62644e524520e69cde018224efdff9b0
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=asphalt+legends+apk PDF link annotation
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4dd04f166---befulobopik.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/kegulozegexunoromawebizi.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/kavid.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210919130253.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/5895072009.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/68438894952.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/31052662795.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/26752711789.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8d6a3fbf7af04a42fdd4ca8f3bad5c9b/xumelezelo.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/30117826120.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/34861963644.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a124811a---91547656772.pdfIn PDF document text
    • https://cargotavio.ru/files/file/99382472567.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/85486452485.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3cg7qtu2mk75n6ql6sk6g60rgu/nuputimogigewevoti.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/bemifomuwazutudabud.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4a5440ed---nefejorigovisireferut.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/048f071a5570b030ff6edb3ebd1f0166/puxof.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/47039219330.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/gorabukapejapigefanukupod.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fefe5fd98---86768456267.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/60409771455.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/suzelakatijeduxa.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/fiwojijagajexasejugez.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/lizufoki.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/doderejawet.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_off0000be00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE00 17060 bytes
SHA-256: df53f4e0cc1e8aa07dc82f15eedb1b49fe5d63a19d63883e55075d9c321fe321
font_01_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 10432 bytes
SHA-256: 21d1c9b5b3c82180d51adb33d86b2fccbbf69dde188538c68e5c2fa1a68a101a
font_02_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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