Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fee34361a43b169…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 07:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17af97301682f4bdf5dea5628efbf2c6 SHA-1: 66969f2c25a03c312287aae2ca86a9ab3b6e36ed SHA-256: 3fee34361a43b16981c17f64ebc9d070c7ce963c20ae92ed3af7ebaa74f94c18
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and link farm behavior suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://gloriamus.org/Uploads/userfiles/files/76908544472.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f2bd90c2875---11431064185.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6ed67c7a---gezepopanag.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/90oi9o51lt4t9a717usu19a9ak/tefebosibesuromodujem.pdfIn PDF document text
    • http://strandedtattoo.net/file/97701825651.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/75336196618.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/99fe4494ac6d50707517063739f3eed4/79267287628.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/65314665073.pdfIn PDF document text
    • http://bushurov.ru/images/files/59511970838.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/96148556988.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6efcc8958b---ribivu.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/cdfc577cc6ef05fe478f3b0ddf1d4ebe/gibodelakawikitujazi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c7f11c77f7c4d6698126454dba7443ac/81909855165.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/gimupesizur.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104302300315585.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/18374379676.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/70160757670.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cab7c759c---lekazo.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/kujusatagidoselitonu.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/81165030362.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c22e656fda0e786bb1c105549300bbf2/21735523669.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/54946800147.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4de2a943f9---50503472422.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d2be8eb4---83005371329.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5ge6i3t4i26upfgikq3e3jjlne/3657536184.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/sidez.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8bf70dc02ee57a0a27df6243d087a21c/63112595487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=physiological+needs+of+a+patientPDF 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_off0000c47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47B 16604 bytes
SHA-256: 23eb893cbfdb4c88fb17561b49d13eaaadeb7a7f8c5f999ae184d6ae129d6702
font_01_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 10916 bytes
SHA-256: e06d1e45791345b45ac444293e85e2a32f0b4b09b3269d19d070aae0f22a555f
font_02_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1