Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6bbef9cd4b68b1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 20:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9252212dc480b64fe9885100ae036875 SHA-1: e3598db3266cadd9f3a7b9f50b554db1387cbd5c SHA-256: 5f6bbef9cd4b68b16c7f96d79741ef75dd73473afa7758584c84cfcc9f674e07
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses lures impersonating signing services and instructs the user to open a password-protected archive, a common tactic for evading gateway security. Heuristics indicate it's a link farm on disposable hosting, likely serving as a lure to download a secondary payload. No scripts were extracted, but the overall pattern suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0a97qf93070d5n6shl66f58dl1/71561366028.pdf In PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/vuxakalumaminarevu.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/bavunasogaja.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/dalozewova.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/jokojafozaxobodedunuxuvax.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/zonijapipasizekewirew.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e859df93---totunosomagi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160774eb61ebe2---25332589651.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890985edb30---15705455326.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/36183461427.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/20828759844.pdfIn PDF document text
    • http://kasargod.net/uploads/file/53059112189.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wisipe.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/jamuzepapekenanozoduxitax.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/89c007b4b0a2f1e4dcc3ef94697a3c47/garoxigewurinufok.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021080200155973499.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c104cc41464---66035273608.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/93a6416c15aa1650041291d1194eb522/27936850786.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e00368a17e---38303186518.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210724_0CE685C3487E7E50.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/68ea221943fd37bcc638e05249384eef/9042820672.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202181025303121.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116f6a7eda53---96717413115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=adobe+sign+pdf+documentPDF 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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 18028 bytes
SHA-256: 0ea01833375046efe783b8e84e0494330d7096c2d5d0a5b313de5dfd7105fb46
font_01_sfnt_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AF 10876 bytes
SHA-256: 7b4a98d7883f12146fb58c0ae3fa6e0f428b34e8d256fb3e7f7cd20b760b153d

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