Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce72da3c6215b9f…

MALICIOUS

PDF

73.5 KB Created: 2021-09-09 18:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f868f20427ebce1d8de12f1428214ac9 SHA-1: 33ae2106a0e856f6a5fe0a63fefe778abbb3f356 SHA-256: 1ce72da3c6215b9fb42b21da4ab15299e59f02f0a7ab5aa56ec522d4fdda8111
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to external sites, many hosted on compromised or disposable domains. The PDF document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://goodwill.pl/userfiles/file/dopukiletibagiduja.pdf In PDF document text
    • https://angkalaris.com/contents/files/50044673365.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/fivaxox.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/xofuwukub.pdfIn PDF document text
    • http://umhouses.com/uploads/files/kipajumogemomulalaref.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e3686b0e8---74297887383.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/napitaxe.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/kajeviwapopoketaxe.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f8d97523---65383454513.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/52891515701.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://laptopserwis.com/app/webroot/media/files/wuboru.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210908191825.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/11412509899.pdfIn PDF document text
    • https://frisch.ro/files/file/maratalosoduwago.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/makiguxosavated.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134318c2ae3d---boxipawosalabofora.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7e095e677f9bb7b26caa080daf066133/nitofixefesebivutolikin.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/63149406125.pdfIn PDF document text
    • http://alkanboya.com/files/file///88111881809.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68888074503.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/14111785063.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/8050708004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+fighter+nesPDF 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_off0000bdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD4 10448 bytes
SHA-256: d9bd9d1db53c754ee9e894a220e20aeaf5c07f9b8427bb9099eb489e8c18c8ec
font_01_sfnt_off0000d572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD572 17068 bytes
SHA-256: 0c479f7f26f9273a0ef90e231cc27ef2369dd94d2bccdedf71b8e7e42d49b605
font_02_sfnt_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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