Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e5c0c49938ee3f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 22:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 141d70896123a2c70ff0b969cbde846a SHA-1: 2d3c4d2ff25b467c917c48774b806a85c92ddc42 SHA-256: c1e5c0c49938ee3f0865e7c819ba1b165b6fc36fa2a29355db14a6efece7d210
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous compromised websites, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of many external links points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://taihegas.com/filespath/files/20210820034209.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f565695a40---53061846163.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160fc76964421a---wefoxaxobive.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/rinivagu.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/54859671807.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/86872794711.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/vepalugoluzige.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/955001769a27cd7edb322bd2f8bbed61/momeluj.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/geduzibeka.pdfIn PDF document text
    • https://fishuntpesca.it/file/fesibojib.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/9515874541.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e17ec81cddaf44b0db1faeca4c75823a/92519473705.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210715164306710686j42djt.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/kozujolanevatulutuwexinob.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1192ac47---zudifowogefo.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/dipevidixezuwol.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/69257086013.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/20972404595.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210608131758.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/vobanunun.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/zitesubojef.pdfIn PDF document text
    • http://distributoram.com/files/file/xanagobi.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/saguluxezisizek.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be3a40f3616---figulozusuromuputiribu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bfe99e7ad---86378778611.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/96203daa8aef1592f655442a2a73ec47/totopokowupir.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///soganenizowowavoluxigero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=heat+transfer+conduction+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_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 10660 bytes
SHA-256: bfd6a915a3f25d132296461a475b45d842e1d1e7ea16dde45b55450c9eb4ae8d
font_01_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 19332 bytes
SHA-256: 7972d35778fb1e81cb1cbbc41a2bccd5f05b0468d908110a9888d87f22a3cc2a
font_02_sfnt_off00013039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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