Malicious PDF — malware analysis report

Static analysis result for SHA-256 caff953fe932c1af…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 08:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1f7abd21788f9ecc652af7622499f82 SHA-1: 214251d3becb05cc511c7fbfd6ede3b326564861 SHA-256: caff953fe932c1af79e72817deb8e8fe94843665ed2bdd72953fcb66dc922180
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of link farms used for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://fobh.net/userfiles/files/bewitusabewoj.pdf In PDF document text
    • http://dispensapertutti.com/userfiles/files/41297661976.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/wujabixisiro.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/zudamewujazomupow.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/gejarexiz.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/9844073824.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/fukin.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/62775563864.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/sadebaxogumatokudof.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613736683aed9---jonurixobatof.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613461f1943f2---97455851560.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391f1c31d66---22633286839.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/wazupuxuravudoratug.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/84468081967.pdfIn PDF document text
    • http://aa-nusd.jp/50264335586.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133fdb03670e---14078861083.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/solelowexegodaral.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/nonagogubutizetise.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/gutowalemimezuxonuziju.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613a824ea35e0---69669627040.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7faa56619a1ce571d5a57ce6946409cd/52426880178.pdfIn PDF document text
    • http://xprchemical.com/upload/files/bazeladenupobam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=stick+war+legacy+mod+apk+unlimited+goldPDF 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_off0000c05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05E 11156 bytes
SHA-256: 00ee26d7a9c5cf75d09b9b77c0404ddb0e40d78c5ddff58d50242d9ec0d4f266
font_01_sfnt_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 19340 bytes
SHA-256: 7e2f65aada797888b134148ab5dc94d5b63b5d0bc53849c3f335269963235f3b
font_02_sfnt_off00010c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.