Malicious PDF — malware analysis report

Static analysis result for SHA-256 063ca33287460354…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 14:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e550831b61cff6ce6f7199f59274ec43 SHA-1: 9524567ad400dae0e51fd45469749e3a139c5bc3 SHA-256: 063ca33287460354964a1c28588e238c747d66a37a7c80935391ded1c0e9c912
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://hoangnhataudio.vn/media/files/29746314220.pdf In PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c09f93314ca---18356285084.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787f4e256bd---wejetotapase.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/32597254964.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/33620308703.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/guvobofutubasaj.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/28d83b6274f06190bc9dba5369726517/pofexu.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/47047226658.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/62453986450.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/50325472671.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/nejupe.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/liniwaramukilezariv.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/64083364560.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/6cadeca49a114b7a1f4a9d8620bc47fd/52912501356.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/petuvitobomebikul.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/rowemejalisorilaribekaji.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/634vcp6nf64q3gm22g7fo3c05d/nimofiburuxukolimiluzuj.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/momipi.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/vuxitivagedosikifamaf.pdfIn PDF document text
    • https://norservis.info/files/files/rogedezaluku.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/23952089483.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/19299606338.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609404aa9a5db---35211523879.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/2703408889.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/sofenufafopixosuxotonev.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/32402217419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=manual+da+camera+fujifilm+finepix+sPDF 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_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 10888 bytes
SHA-256: 8a32730b123d71842a84ad4461ed8ee1967845fc5b543195e17e110936146f44
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 18964 bytes
SHA-256: 8025acfdb1284845308efafe09362722e301f48e2893cb42688329ba7b31a6c8
font_02_sfnt_off00012cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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