Malicious PDF — malware analysis report

Static analysis result for SHA-256 57935f0ad048ae77…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 08:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 263e2fb59bebc6cab19f972b3a761d8c SHA-1: b42e87dc2c5d6589ff4592cb6162aba4205334d1 SHA-256: 57935f0ad048ae77bdc7a3ad12127700caf577160d8d5bde0e3279fe408b032c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=sites+to+download+android+apps PDF link annotation
    • http://medob.org/SITE/files/editor/file/74502466079.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/92420099162.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614307f687e5d---fajitesusawovawid.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/37314010202.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/vunigivuxodonirewumokakim.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/69132096068.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/52802467008.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431c2cbd54b---berabivugawa.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/32568159579.pdfIn PDF document text
    • https://qnzar.com/files/janiwawesozuwuguk.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e03dcbb28---28875584546.pdfIn PDF document text
    • http://ecole.ru/text/images/file/sikomavefetamevekukam.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/8096763341.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161377e273d9d5---4473013253.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/54206969785.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/rowixuzubojat.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/92659272518.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/bimaw.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/75598836966.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5670d71fc---gobazamawanotomaxexojoxif.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/jiresawobisojuwu.pdfIn PDF document text
    • http://lgassociates.in/uploads/73656845071.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210916124423_z73g9p.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/5698283951.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/46519917414.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_off0000bb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB45 16616 bytes
SHA-256: 0c4c03bafb78e83c971d124e0f49bb6db304448b7501279facb43363e8ca8ed4
font_01_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 10544 bytes
SHA-256: c808a43c5c625e37972585bb1024a651717e1751bb7b401efef9573539959221

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