Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef570775b579146…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 18:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fcf127b8412a92e4d10d67b05b429578 SHA-1: 91a068e097378d58d40d4f44a49f1cb9d3db1806 SHA-256: 9ef570775b5791461c56c8572b35db429d2af04c372876f76a7f8f6aed932ef1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to lure users to malicious content. The PDF structure itself is also noted for containing duplicate objects, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://imbirimbir.ru/files/55353550233.pdf In PDF document text
    • http://janandpoos.com/clients/872640/File/rigokusi.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/wuraxizujobaxu.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/jidigew.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609630a7aad57---kosonemogetabetopolunari.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00ec0b708---mudawisubirofatel.pdfIn PDF document text
    • https://lordoptika.hu/files/files/damezuvuxaseduxenopemivu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d875f8794f---27662859448.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8kpg20ukoogctnbbvn6d57hpti/xugawelalatuv.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071a775e9357---27696172613.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/8160539250.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c083d3daaf---58149592093.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/hotndn8ot1q52hh571l79s7pga/65094053246.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82b0ecd8e---puvabakoxixikixusugo.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/suzugidibowusuzusuvugeke.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/572cfa708974f4870a7af0874cc5ec90/88232362928.pdfIn PDF document text
    • http://capital96.com/userfiles/file/nugesigov.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115a8fd8885a---nadenagaxekonujevijarize.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/fezujivebekujexobe.pdfIn PDF document text
    • http://saydersan.com/firma/files/posiwazupitad.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/vezapotalabefatefigew.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16080747359fa7---jatilovutepaviviporaju.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/aefb847e1412e258b999457b11a249e3/60909231777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=1982+yamaha+virago+750+service+manual+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_off0000d3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 17600 bytes
SHA-256: f775a1dd94b5fdf3483bef358e7c000585b463900bbeae345abc261f42a11468
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 11844 bytes
SHA-256: 485b2e3394f7e69b25d7386042667fc672ed46fae186c114ce5146e1f1d13499
font_02_sfnt_off00011cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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