Malicious PDF — malware analysis report

Static analysis result for SHA-256 69997b73e14d93a1…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 06:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ab5b224bb84dd8370d1ef3a22fc4fda SHA-1: fdf31996adb5b7ed466827cdf868a0ee9d0e1813 SHA-256: 69997b73e14d93a11e157c404cf5ecc4683ce8846617ae68e1a02eb00a0f62e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://cu-mbc.com/ckfinder/userfiles/files/vuvekerejavogoza.pdf In PDF document text
    • http://goodwill.pl/userfiles/file/xawutabomevulu.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/64753180654.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/90983972725.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393e4a0bfe7---79246788996.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba76ce9ec8---16107090795.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/benasenunatak.pdfIn PDF document text
    • https://semut73.com/contents/files/galafupaxikenopifefiker.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/pd034i211gcbd9aqqv9d0ipmg4/57524159435.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/99246391581.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133270e90112---zadonijetikit.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/kewesusojuwikekavelor.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/64388937892.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/jilubitinajo.pdfIn PDF document text
    • http://compsult.net/userfiles/file/47244008287.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/13551532248.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/6527418138.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/jiluxanixidekatazo.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614056dba8c20---26511919909.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be46195a84---tenovuwimujatowan.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/30469132952.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/dekonoxepibolufujiduvut.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/jemekopugifapekubub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bollywood+movie+app+downloadPDF 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_off0000b336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB336 14644 bytes
SHA-256: bead2f7dad183fba9a106e6676f7178f0bd85744048c195bfb3e8aa998206e79
font_01_sfnt_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 10504 bytes
SHA-256: 954b34191165743dc770a26f43580ab9ae41a399df2534a5ab302bd37fad6223
font_02_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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