Malicious PDF — malware analysis report

Static analysis result for SHA-256 f737f99489ecd74c…

MALICIOUS

PDF

92.3 KB Created: 2021-06-28 23:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d835e96efafbef4253b9c4fca491d56 SHA-1: e5e7f94cf456c7cf591d341ce9c93b4d16e44e24 SHA-256: f737f99489ecd74c32d173fb581b93b8148df8b19f367414424ef9541f7efc1e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, facilitating the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/67v066o9fp921ob1hs3r43mdgh/37347916924.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/dc71b15be37d4a376832f15fec60c7fc/1230312570.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/giwoximugoxi.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/bidawileperima.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26b54d4cf1---67874813697.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7bghikbg7huhijaesj2qh7libc/vinabazugi.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9ebc460a0---31197530704.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/v13voi8aqescao41e8e5q6ljm8/58339510323.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984013c9391---76603179350.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/begufugawakaze.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/nuvozawu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70c0d69573---51243954025.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/65049578078.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/15700326749.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/47274394898.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c132b2a906b---74433000786.pdfIn PDF document text
    • http://oncallanatomist.org/ckfinder/userfiles/files/nunukeva.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/45a4ec7093c61d032faff0d68d1bcb94/95575555595.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/pidowelom.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071073a2a4d9---24614183772.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a944d7614cd---lariwiguturorubuzazefen.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052320244669.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/f6b90a0afb6320f18d8e73fe267932dc/jofimunuveviza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=degenerated+urothelial+cells+meaningPDF 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_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9E 16780 bytes
SHA-256: c20554dafe47f83ee081fdf4f655201b18409165c0fc5e382ab56f3aae797e22
font_02_sfnt_off00014abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABE 10920 bytes
SHA-256: f78639e50293fa40d5e3381e52d9ffb401aa2c35df222ae396ab42d387f4dc8c

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