Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f890e8659a10bf9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 21:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a748bf5e3964fb0714d1e9ee68632d7f SHA-1: d1374e02dd3382017e09c7d825974db2f7e627dd SHA-256: 4f890e8659a10bf9f7b22b3d866533a18205f3233a516f1667982d55dc13f521
184 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external links, including one pointing to a raw IP address, suggesting an attempt to redirect the user to a malicious site. These elements, combined with the ClamAV detection and ML classifier output, strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://the100voicesofgospel.ch/fichiers/newsletter/file/pabugimusutenik.pdf In PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/xozijopileveki.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/rirotisogogamodixe.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/62755237124.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/kudasewinetevabuk.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/romitudiwekomurosotun.pdfPDF link annotation
    • http://pwharrison.com/userfiles/file/wufuguninazadamolaw.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/67634638325.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e13e340ed7---ganof.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/e62182b5769507efbdf5913755fff033/74838488680.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/tumatomevimimukonuja.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/koxenotalajijajuserefe.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/kavudajebomanibutuxeja.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/82351345854.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/30511068327.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/wilarixib.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/borez.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/walaxolelanoja.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/54584899531.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/xogomavaviwomuze.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/tunekineso.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf7e04c89---zasibajinisebolumuvu.pdfIn PDF document text
    • http://qdjshg.com/files/file/22057883804.pdfIn PDF document text
    • http://aa-nusd.jp/wixavanojilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=used+iphone+8+price+in+bangladeshPDF 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_off0000da9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 18884 bytes
SHA-256: 7e355f996edf0412bdf0ce8c0bc751f7c0b525343daad1008070b8605fffb1c4
font_01_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 11052 bytes
SHA-256: 1bdd33d8f2905c2fdf2f20962333c5a4912b87df0bfd892dd212810004375ccb
font_02_sfnt_off000124e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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