Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba685a99574af534…

MALICIOUS

PDF

78.7 KB Created: 2021-09-03 04:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: acc7d681d665d3a268a79a0e1094e716 SHA-1: ee0a43b0683e52e80cd8269fee791ac226f46372 SHA-256: ba685a99574af534ffb842c42fde73a7c4625a9a626a611f4dee0ddd8df84ec7
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 0.9953

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://ninda.vn/userfiles/files/78365831223.pdf In PDF document text
    • http://swaminarayangm.org/userfiles/file/890500591.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/wejavigadolumexaf.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/6uhdhoc53ptv4o484g59srsq1d/buwabiwitimevasa.pdfIn PDF document text
    • http://goref.ru/files/file/45253608347.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/95139655072.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/n0r960q1lscq8u870sm7hluvg9/napenonijum.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/63823e481c2edca80f4d26844b402381/gonusevoxorerexuki.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/59695482578.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/54764352434.pdfIn PDF document text
    • https://tmtteks.com/files/nulusewaxigutinivipi.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/gdt3l3vfsdj345h2clckpuqueb/tuzidubekerimimib.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/vexogopodilufo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c9c8ifpvt48gm8hehjqqvpgfp3/55324960928.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/sizozoberoj.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19305403d---fixejurufuwodupatanug.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/kefobelonupuf.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/6349960070.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16085663007899---xinunirex.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43f08b5cb---17196019818.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/65873293298.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/makapojemidanimebivariga.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/54055180249.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/10910980796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=theory+in+contemporary+art+since+1985+pdfPDF 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_off0000c1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B2 11480 bytes
SHA-256: b4fefc17e4a0bda05f4a7da73ea084070a83d583b33856f76790e5de57040ad2
font_01_sfnt_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 22220 bytes
SHA-256: 29d783816efd2355c523d0af04b1227c441ea067473935ab428ea16f09ec766a
font_02_sfnt_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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