Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e13eb297584ab71…

MALICIOUS

PDF

84.9 KB Created: 2021-06-25 17:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c6ff2b4b4843b7ae3ad2982973358dc7 SHA-1: 23a79a0a429822b70caa24fef1be24e0081199d8 SHA-256: 6e13eb297584ab71950fb892aca09a65bd5c7ecbc353a94b8d0cbf0ab7c2035d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress installations or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/3935041484.pdf In PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb9f10188---31211578697.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f2d0bd742---velezopoj.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/68eu0908q5cjq03kf9bvm37iln/vimarakuxatoxibupef.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6a76d013f---33436094432.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/31921914380.pdfIn PDF document text
    • https://t2sc.me/userfiles/43387917167.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd82113f5a---61977690484.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/195379491e54a8ab0f12b8798bb402d8/fufapugazenupalunisuwuj.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/76711502247.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/14f77749814b86731ac50ea544f56e34/55928617525.pdfIn PDF document text
    • http://turatabor.hu/media/jerexiwonetizutabula.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/fe5c12ce26effaf11b20e8a701a95497/88088618833.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04ca74481---wowik.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5isecqnq8ce1bq1aiqt7sfv7ej/lanajisuveraluzokadusi.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/2757783909a70046d2664193832c61ce/89779238672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=signs+and+symptoms+of+patellofemoral+pain+syndromePDF 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_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 11032 bytes
SHA-256: 7f4204df573fc370b7e86de1d2e24efe01150162e4a0a9b33032c847a0afe2d2
font_01_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 17044 bytes
SHA-256: 0e5f81b9154c2c25de548961eb67227c2a9fec635deb9d0153e4ffc368f8e316