Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cdd27b6cd9d2ba…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 04:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a19087c642c6a3b61fd55548f6a37f0 SHA-1: ceb54cb674dd1113445f71b30a86ca6a3e5e5a16 SHA-256: 91cdd27b6cd9d2ba96e53cf5df57f502314f08254d83ee427aa80e3f051f27e8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=basic+scout+knots+pdf PDF link annotation
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1dd39132c---77094426194.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/fawazisuwuxekiru.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ce84f6236d268edb2b295c565d0c2e8e/26612028804.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67213133620.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/mcsn57khh7bp0e3390pujgbb7u/63032159081.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/34486065864.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c0742ec7b1962464d404998b2473dfbf/sebexomes.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/70735565553.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/dbdd6aac8241a4b84a8ef74172f4845c/sogevubaselatov.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e77769091c76bdad3b5a0d0591aef9b8/93515120601.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/vapowajaxinawiwubodaxum.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4bbbd578d---kibuxijemosawid.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a13bbb42ce0---29394211482.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/zilinefelufifipij.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed14d2d070---vepoladadofasobiwalimoso.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/runabek.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/t02tldjidhr4mmmv2dg846ci0c/86573467291.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/gedujopovitebivipiwono.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/46834169079.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/lirewufopunirinezexokova.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/99875341311.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/jilaxoruvosunovabiguf.pdfIn PDF document text
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/pabotidofesenozed.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/kupexugotirabivaluze.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 10580 bytes
SHA-256: d92a7f48e5f2caeb4c424f30b745f9e9b084c726698d5cc8fce7d3d8b71fd89f
font_02_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 17204 bytes
SHA-256: c563422c306089df61bc0cfbf02ac8b63617e17fb4909fdfad7cdc4d149bf250

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