Malicious PDF — malware analysis report

Static analysis result for SHA-256 db21655af6be79c3…

MALICIOUS

PDF

69.9 KB Created: 2021-09-07 22:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d898b9af28b56e64a50ef15da01a087b SHA-1: 4ecac833ed7521f23b0c2170b8ff37a3e43f28b6 SHA-256: db21655af6be79c3427bc7a5c706c36fe14a7fcf99658783332879b9ee9dfe8d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure victims. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://archism.ru/uplcv?utm_term=anemia+perniciosa+hemograma+pdf PDF link annotation
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf02825523---94667016377.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/11304616871.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607814d54369e---73639035001.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/39839811569.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16087b30c9ec23---fibumatelemifovavefizan.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/39222913351.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160937d514a411---11446900030.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/vuzokak.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/gekuzosureteviwifewe.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/pf2j3educ3n1255dn8ilh9po15/sidameliwuduzufivikozib.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/49750219895.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/58318252428.pdfIn PDF document text
    • http://df-foundry.net/d/files/xipedutixurepokovota.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608969f981744---bidomoxazividukogebelovil.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b8e7e1695---gafazezafaregamalurogiz.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/19304217073.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/65781232063.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607325dee59ea---64151599695.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/4r8f1in2haou16qkmjkks7k897/jolimowotazuroxajix.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/ruwenezewosexetekuza.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea17ecb9b---89449245002.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/29002002312.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_off0000b034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB034 15532 bytes
SHA-256: 7c8ba481ed9e764ee7328b48cff58c0fa36897d52bca8e44c50d572426820e9f
font_01_sfnt_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 10904 bytes
SHA-256: 1ee8aa222ff380dae2305ecfc0ddd4e604853462d28806269372f71c05580103

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