Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d028314302a09b5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 10:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5610edece1674743548c50133e58a5d SHA-1: 42c87d03d56e866447f8342e0e8656d08bb56662 SHA-256: 5d028314302a09b528053b56bccb0ebb09079843927fda325bde269df5176203
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a deceptive workflow. The primary attack pattern involves directing users to external URLs, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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 https://garglob.ru/uplcv?utm_term=pdf+file+convert+to+powerpoint PDF link annotation
    • https://5a.ro/ckfinder/userfiles/files/demikikolizozunoduseber.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b9f833210cc76936c56f77d58d72994c/pewakaxitudebewi.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/47627570609.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/50547957692.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/29914066249.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/62cb62c05c443c57ee0e4e19ca405a25/dimuwezezezudiwusefozugak.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/u1f566brpjub93tlkobtsnkqhn/95216165344.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c0863afbfe0f5c1a892ac2990447eab7/21094570653.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/56537875680.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a67a4eef226---fajagozapobizu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac869a6148---davarelegivebafe.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/24917035496.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021082706290627.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qpe39to54jlta305hs8s3cstj2/nemebowazabufavi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160d022c53b7cf---91840641829.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0738002ee75abcfc87ff8af6fb0032ac/44960644617.pdfIn PDF document text
    • http://cy2hand.com/userfiles/50841494001.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/liwobewugojutex.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/pisoropubepisagezonerip.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/56uj079tfj3o6dm2b3qq3cjoio/50389186546.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/11620655697.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/cb6bb3561dabc19585c5758848620544/26946120615.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/95313463455.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_off0000d523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD523 17600 bytes
SHA-256: afed37b1f175085ff8c8db5ca771713ccb2b55d6f5c9ca35b1ddf2dfba9b6ef6
font_01_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A47 10436 bytes
SHA-256: c7e85e7a36401da85ed30ecad78fd347a2dd13fa78a3fa850fe5c4bf9a0763fe

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