Malicious PDF — malware analysis report

Static analysis result for SHA-256 921fac56050e7ca4…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 11:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80d98b989aec21cb09a1bbe665706d34 SHA-1: d873fbe37a25309604160a8f03a79a065c2c909b SHA-256: 921fac56050e7ca4e098b7ffc6f66d818f0748116278a1686e744e7d40c71146
172 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised CMS platforms, suggests the document is designed to exploit vulnerabilities or trick users into downloading further malicious content, likely related to the 'good conduct certificate application' lure found in one of the URLs. The sample's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ketchas.ru/uplcv?utm_term=good+conduct+certificate+application PDF link annotation
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d789a4ea5ec---14604023236.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/bb072749d95e023b9db16a3a90ea7fc1/84455320190.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fsq83jf45nou3jpqqv4k0ladt1/nujefazajufu.pdfIn PDF document text
    • https://cooperspick.com/files/52142301602.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b85e8a7ac4e---vivazelajupilidaxu.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/64117111797.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/25740994477.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/melubulizigebugej.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/ziwiwepib.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/lugamibedagugovapoluwi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608160ea3eb90---gukozabage.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/jigupixitoxaseferopu.pdfIn PDF document text
    • https://avenue102.com/uploads/file/43934338714.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/24/file/20210524_160610_185.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/60145166883.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/34799688149.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c077c1957---jewuzibizorur.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9de9a7ea6---95214744093.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/vipaliguvotitu.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/40896751980.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/namimofugabijepew.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/95173341652.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/bidimudagosunorudisofi.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_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 19348 bytes
SHA-256: 894541420ab1798d457f457947a807667713c051822a5ac7b4121505a4a38fd7
font_01_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 10584 bytes
SHA-256: 03089d6540137c82c76193b5e72f68bf183a48e0dbc59a18e9447bececf7a655
font_02_sfnt_off00013145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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