Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d737159dad02b8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 12:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4647c8a61e94e8c975fcac021b54f5a3 SHA-1: a86fe5cd81e1020eb1e77492db0107d98d404353 SHA-256: b8d737159dad02b87b29d98fd875fea3d15b43b543d22a3fe7281771c63cd617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=kozier+%26+erb%27s+fundamentals+of+nursing+pdf+download PDF link annotation
    • http://vrieshorst.nl/images/uploads/file/rameliwunujokogutalu.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/15592641602.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/wotumumikakon.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/toxapezurajawawapekopope.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/posoris.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/85217369806.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/biwovi.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109052334367344.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/wokaxamisusibanofube.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ulgas29qgli6i0dnavl86s5tbk/83718454605.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/44964226545.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/71011764675acc7aca78b7b2dba74c62/nutukojakuxiwuwogoviga.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/53430102050.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/2603753099.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/zirobeno.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/81881577330.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/wafinikatazikis.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/xuzof.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c646c88---ruxusakujil.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/27658747000.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/lezitimoxuni.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/dudubiwomiwor.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/pokebe.pdfIn PDF document text
    • 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_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 9568 bytes
SHA-256: a6f11b7c1a979c75c692b682fac7820356fec6d8c0c99da014d2591f789f4a07
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB6 17504 bytes
SHA-256: b750dd653c6333cb0137d8a13a7210588e394f67fecd0a3f3cacc5754d0511e3

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