Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5b66f71eeb560b…

MALICIOUS

PDF

114.9 KB Created: 2021-08-12 05:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3d5a019edcac9210cc7ebe44744b24e5 SHA-1: c8e2dd421c25a7add87cc39a17c7cd35e9514510 SHA-256: 7a5b66f71eeb560bb212b54b656eb455895b1429791ee0173aedf8e6675fcadb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=oedipus+rex+study+guide+questions+and+answers+pdf PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/afe406820de04ff0da71641c1cf1676f/mifarixawuzuxuk.pdfIn PDF document text
    • https://drlanda.hu/user/file/refarasazirejarekon.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/28jbdo0k5e6ih670r1c7hcppv6/dipaxefewebisa.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/nilolexexupi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608496e55e2e6---wamifuf.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/88245050830.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/85254714897.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/gurutevejojiz.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c55c09bcb384c16a56443b56259e04c5/8556358417.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/rumofojiwuxibopavot.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0968b1b54d---tapaluxitebuvabug.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/najitufopapogipugof.pdfIn PDF document text
    • http://hydrem.ru/images/file/42428479237.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca58c404ee---84109259744.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc2d5ef839---52017805252.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/cfb001499343e27b371414675266dd31/31062017679.pdfIn PDF document text
    • https://bataretak.com/img/files/file/8859226392.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/fobisoxedamevatufow.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/xuvenowutosuwager.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/13718380212.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/zojazojizukurobunowadisa.pdfIn PDF document text
    • http://slsnn.ru/content/file/76395294688.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000158cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158CB 20020 bytes
SHA-256: 7bace84de56f35a065a0d85694ca58003c41f617b272d2718a51b53d98654c2c
font_01_sfnt_off00018b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B3D 11200 bytes
SHA-256: 076346f302c1d1bc11c2b04d3a7e8e9e1eca493b279c5cb968765f93e2fb535a
font_02_sfnt_off0001a52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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