Malicious PDF — malware analysis report

Static analysis result for SHA-256 1659db0ac8964edc…

MALICIOUS

PDF

90.0 KB Created: 2021-09-05 08:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1ca92d8248527b32d55ffb1f8ee92b1 SHA-1: 188a1109d844d8e76013d048222d64cf2fdf185c SHA-256: 1659db0ac8964edc0ae7b925c7b772f66bfef4268e0120ccaeb2065f9adc18a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://coretry.ru/uplcv?utm_term=turkish-english+dictionary+free+download+pdf PDF link annotation
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/8a951bf4ecd4a905a44e7b2641e8c7bb/48038948026.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6918ce45e4---34162365129.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/fbaouikmv9e7430se68u5cdrm7/71989760723.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/woxedokewir.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/38886406542.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971203b188b---sinamugapus.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df463a4927---30065593303.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/51090411628.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf2f5e594---57427924199.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/4rru6bse43p060h9524no0hn41/xenamilipatetamusugo.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/xufufozijetutapoxovaj.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/b79f458f8c2c828b41a93ad33ee3db58/79198701427.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/47337378015.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/lt3bn8rj7nuk7o349eg0nqoibq/70432795208.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0gvfcnvlk2enetiio5639v38qn/81005963970.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/257352f39f2ee5aacefd7bbab85fc3ee/89436569809.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8b9ff4ad4744ff7f946bad472e61a8de/69565946976.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/47291229489.pdfIn PDF document text
    • http://bscartridge.com/pic/kesevali.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/73546209027.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/127jejv8qtvd5j9rs45v62u22a/50157277823.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e0d236fb5e662cd87f4dce941a0a5b2d/77377731500.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_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 11288 bytes
SHA-256: ec3de4c187afe774db297186dae01a867e472c9f96e6dde08833c2d0d4372f39
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 22804 bytes
SHA-256: 154faa1e1731798345198e4920aed700dc79cfeb2f855a35bd4d664a69123bfe
font_02_sfnt_off0001421a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.