Malicious PDF — malware analysis report

Static analysis result for SHA-256 48406e5a19311ebb…

MALICIOUS

PDF

75.3 KB Created: 2021-06-20 11:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3bee516907f86115b0a57fb84f8fc06a SHA-1: e7fa2b255051dcc9dc35cb39048eafbf39699af2 SHA-256: 48406e5a19311ebb8aea79c429e4adb8ccb1df721b05b48067df250776874b26
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816c677a893---68377007609.pdf In PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078a32b16b5c---dutasib.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/5f27aa8904aa1ea21128eb4eeebb5dd7/zusesifusofo.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/14459728693.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/rizabijogux.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/17253584628.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/tajino.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/31266115712.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/95500413676.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1e9b294f9---71702973342.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d36792eeb6---66252322565.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/8231127994.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=wrong+turn+2+full+movie+in+telugu+dubbed+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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 5484 bytes
SHA-256: 02c409bc918088ff6c604ef43ea2591c945d15181c96e4afb5c6c019b9d76d1b
font_01_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 11172 bytes
SHA-256: d0161a7138cdbc2348cc1d66aa69ceed2c395c79683e93312522a5161a5aea07

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