Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2369c00ccdcfe5…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 15:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7217d4f9453646da6ed18efda993eb2 SHA-1: 27db8d682b873324df7bc046aad515efe335ee62 SHA-256: 5b2369c00ccdcfe59edf1a3050fcd7c710d187beba3d683448f07f52a5ad1f3b
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 multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links point towards an attempt to lure users to malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac12c07bc49---taxikixanixidegupak.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c06592c5e0a---sedowujuzudetosokox.pdf
    • https://chrmglobal.com/userfiles/file/88523007485.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/53517317265.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/zubuw.pdf
    • http://graficaeformazione.it/userfiles/file/gifaponipuliruwexuf.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4c6a564a20e14d56e8a4efd9b7ed6721/52931763302.pdf
    • http://md-servicios.com/userfiles/file/18304074004.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/73882134044.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d91285bd---28684718920.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1611e64c9ae069---83120086720.pdf
    • http://photo-preiss.com/upload_files/files/46083424089.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d8dede76e---58684394267.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af46bb489d---19114387248.pdf
    • http://www.ecvbrass.ch/user/web/file/65092327771.pdf
    • http://namhungholdings.com/uploads/ckfinder/files/bimumujo.pdf
    • http://leylatoprak.com/userfiles/file/61867457659.pdf
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/fubimiz.pdf
    • https://tempatpasang.com/contents/files/karujalisulezawipetamo.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/wobajikemapiz.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f7b9e2ca77c1d091b6a4df8f365420b4/81446522607.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/6kpm29dobf8ndep61q51f8a0v0/ruzuropifaxe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sunbeam+mixmaster+850w+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5c.bin
3cd096c0bc6b725e7a54769e9ca11f3a4352715f3a684f2b04d0ceddb033f49c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 11116 bytes
font_01_sfnt_off0000f560.bin
0511720ed496e5ece333cf546394604d0462e758e2a4a01a680b06419cfb9aa0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 18640 bytes
font_02_sfnt_off00012642.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12642 16792 bytes