Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff487f3fe8896be…

MALICIOUS

PDF

86.0 KB Created: 2021-08-18 09:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 302289f46b7ed54c6e3e4b3dff77af7e SHA-1: c40db90fbeef7eaffe5d8634ac32a9f22d49109c SHA-256: 9ff487f3fe8896be7608c389cab5fd72242d4a56d20fddae2f10850589c07415
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. This structure is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://klusjesindex.nl/images/uploads/fojatodedi.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/62a6bcdfe1dcb731b77367544f406216/solepavif.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/23220427200.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/76523654320.pdfIn PDF document text
    • http://stylekd.ru/files/xazokaze.pdfIn PDF document text
    • https://kildevangen.dk/files/59969471858.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b740f592---21741852687.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7abd2f20cf---susaduvaranoveki.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/7991413390.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/7905570981.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/50435806963.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25cc7716a---897108860.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/1j76gp31ba4ifcgv88t26djrpq/9341249756.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zisodoxusadedadepevu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608629b3318d8---rokofisuzojovizoxefatu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/purusozarawofor.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/o13g41ok0tbbvpdi01t3o63mj4/74212884003.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/tisinomek.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/41401744633.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/jogigudomu.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/64866073744.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d02eed6f7---zukudubutane.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/90056138580.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/75712002241.pdfIn PDF document text
    • https://gangnampools.com/contents//files/58202869692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+use+allshare+cast+on+samsung+tvPDF 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_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 10828 bytes
SHA-256: 3b76e963d5d157d63108caca61f9601f0f3c55c37a2b4f3b61a6a8492b41c91e
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 16796 bytes
SHA-256: f03b11aa0c5ca2eb7c5d69955c05ed8d3a85f67fa27fce02cc71de7da7b32b49