Malicious PDF — malware analysis report

Static analysis result for SHA-256 405cf4741939cd9f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 09:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c3baf75d8133b627a38449b7807a2f7 SHA-1: ec4c93094a9c053a4eebb03242fe5f95d5b12f60 SHA-256: 405cf4741939cd9f3051b941dbf81e0cc39127e4a6feda661e54dde5d2fba68d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded links pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it's designed to trick users into clicking through to external URLs, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2254db5227---goxoxujilede.pdf In PDF document text
    • http://valeneighbors.com/userimages/lefojeraletimafe.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160cff1dae14a9---63361664930.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2jrupvat1lv86rmd7rvmo8htt3/64766635725.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/vefidenenapasowijiguxunuj.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8b8cb0947c7654ed14041e005c3f4c11/90985272083.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6becbc6a89---tunukiw.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77ad310b5---40762230400.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gejulewade.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/55281396882.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/jivajipevibemiwupigenilam.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/89332488246.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe42f9891e---nedezudofasada.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/fa0696ac7ed01861b3f8ddfd90e6d677.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/pipifedirewelamaf.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/u345t9civ60ao9jvek85lu9eu0/60258403874.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0a3f91a79---26106048035.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/26541928450.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/16061277930.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/monasun.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/82455914832.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0322d91fb6---somuvanijupojonafux.pdfIn PDF document text
    • https://zzwgjx.com/d/files/gikoxemipolisetiripe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=breast+tomosynthesis+radiologyPDF 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_off0000b834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB834 14216 bytes
SHA-256: 12ba1069f213f7dc024d91f8fe9da5086b58f95b8bcc4e0f1eff1230c76b5b61
font_01_sfnt_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 10860 bytes
SHA-256: 7ca7b6d6a3814607ff931fae9c56a4f427309c7b58b0b3e14ff74aa18ff27ebc