Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd21b7200489306…

MALICIOUS

PDF

91.3 KB Created: 2021-08-06 03:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3f8cb547c10332a84a13fa47209b0ff SHA-1: 940f4de4df742542754152e6859d2ed028ec8dc4 SHA-256: 9fd21b72004893063a1d87a2b33dc33b5d044f4008f6cfd74bddd9975fc87518
172 Risk Score

Malware Insights

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

The sample contains embedded JavaScript and links to numerous compromised websites, indicating an attempt to host malicious content. The presence of a download button lure and ClamAV detection further supports a malicious classification. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adveotec.com/img/file/80969317251.pdf In PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160853f629c1f4---69309445671.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f2ea05944---21177219937.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/79722544753.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/88619473681.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/86857594736.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/54361769957.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16106980de2640---68975517241.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/debupuzezalodimirowo.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/gisukeki.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08bb49ae2---zozejibivebazipa.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608332a14b4ac---nopubujarogutivan.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608130da4ce19---raralunigopuraropixezeg.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/31f8b82c7886a280c72f58c160a89d9d/4943402125.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/21788227249.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160963c3d38793---27702051770.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/06cd81f0e34a1a903aeeece9588312ca/55677978984.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/donuxipobiponuna.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/33426005757.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092adb523240---95244830615.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/ramozananekabasu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607015e9032e5---84032683158.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/69323793619.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/9748180725.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c92fb1591e2---benijigubabilipegil.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/93022234973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cisco+anyconnect+secure+mobility+client+for+windows+vpn+free+downloadPDF 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_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 11320 bytes
SHA-256: 030e026a5fc61e0f91960614a325cbc2e3e2db087d725f510d90fa5da356aafb
font_02_sfnt_off00012ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF8 18804 bytes
SHA-256: 03832fd64b2817881eb19977753c2d62330b7290b3ef0098114aa335aa3e94a5

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