Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cec33cbdb1d2e65…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 13:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a64e4d0b0a6276e37ea6092fca14d67d SHA-1: 5adf16863fe32963e8cf04d17b43669aef65eebc SHA-256: 3cec33cbdb1d2e65fd37b469d23ede9702bb8ae8f649fcd19279327e2fb68220
196 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing a browser extension or update. This suggests an attempt to compromise the user's system or steal credentials, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://bonekarusa.com/contents/files/gajonenivevabolu.pdf In PDF document text
    • http://ssanadia.in/userfiles/file/80902058488.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/satanogelanedixinajebif.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/zikewofozejuvexafofum.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/tulefewig.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/66292451059.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/senoziporevos.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/funobawexojopop.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395cef044e1---24377075142.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/mijoludije.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/g4jclgr8nnb0bam1dlsatmk6i6/31757732898.pdfIn PDF document text
    • http://rilta.net/userfiles/files/kexeromawowexelazek.pdfIn PDF document text
    • http://altus.pl/userfiles/file/27224636097.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sovonesawunugado.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/wisebinetavawo.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/c0cb1oslddvehtu492rdm5cm3i/malufanabubuki.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/bowubaxigizeradokizo.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/xudaburi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tvtrhb2qekpbgauuhi2c3o7opr/fujeno.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/1596004063.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/90776047845.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/mufumewikejenoladagit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=beyblade+iq+codesPDF 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_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 19628 bytes
SHA-256: 6df65ec345f7a71ddb3645bd8234fc94046f9b0332525e52605c3f0137d6e233
font_01_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8F 10516 bytes
SHA-256: 35bd95bd2bb26cbf375b1626f120f0148beb2b6c2cf47d81e51da4b0bcac424c

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