Malicious PDF — malware analysis report

Static analysis result for SHA-256 b292fc0298cdaaaa…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 14:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c22285ed4be286a07c2f36105126ebc3 SHA-1: 52a0c4e4a7ab27ad461c70e8298bf8ee4c1c1584 SHA-256: b292fc0298cdaaaa7421c036852e9ed190dcdecc31f75037f1e7b779771cd8d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to domains identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL distribution are consistent with a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cpgny.com/userfiles/files/77384149726.pdf In PDF document text
    • https://arvikabc.com/images/uploadedimages/file/xirisegidava.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/72006693338.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/wopojavezudem.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/xedeg.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ed02c7eb---desevunimelonabonino.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/danonud.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/xedozajokufojubijuteje.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/80903496043.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/49372805970.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/vanezolu.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/kuseso.pdfIn PDF document text
    • https://famecosmica.it/file/29218673689.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/n3jtno22lheap9hafrcnincr63/29166105172.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611684f139b52---12835996601.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/311421440.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/89694868964.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/51838532622.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/9a4e2fa0a454fb143ea916284e2fc5ec/44781621406.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/542508724.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/kiwidawo.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/pebifejazekupoloxudek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=immunity+microbiology+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_off0000c689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 10808 bytes
SHA-256: 03216ea691bf557cb19a7b396bbf54b16553b0d165aaaac88a4c2c51707c6b21
font_02_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 16104 bytes
SHA-256: 244984919b461f6b8d4e62d8a7912b066321c30dde6d7c5611fb266e36ce151b

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