Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9707bb36d1a93b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-04 18:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62963de3af796086e813f7e6afceb33f SHA-1: 1464a31b08c25f08dc48997f75d7b2d95498e74f SHA-256: 7f9707bb36d1a93b97a5f52a4ebb1363ecfe4ae6bf109b2fcef2f373ecc03e23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to domains associated with compromised content management systems or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://westpakusa.com/phpsites/vertical_living/uploads/file/samupofevoxexazesidofenud.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608da40f1bbfc---tatovunotupividediba.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/52271877083.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210816142101.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/14009355995.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/ramowojovakunijowedix.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b34bada3622---94763621240.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/s7vs1qho9c5frsaviil6j44re1/sedegimi.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d99eb17ec---63897540329.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tecsfm77r0q71hodh5ov987c15/46796002449.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/ribunomepamipa.pdfIn PDF document text
    • http://palcev.ru/userfiles/file/58811250159.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/68416518385.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/gazugeredikexaganaviledej.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/2179620472.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/2147344538.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/51722432570.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/63229990496.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a818a3164dec362eb8c657ed2108c1a3/2543318739.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/22469465842.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/3ec4e32dbb0f77f0a7b6ef078d01dd50/bixotijegoruparefer.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0af60e383---91652219921.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609484157c856---kepiziserewigodajivamajiv.pdfIn PDF document text
    • https://avenue102.com/uploads/file/sapuxaxunibupova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=affairscloud+current+affairs+february+2018+pdfPDF 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_off0000bd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6F 11448 bytes
SHA-256: 56b3b41de3db5b4aebcb82b59a867640ba81799672fd8a9fae1d49fd52557496
font_01_sfnt_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 17728 bytes
SHA-256: b3b52f73ad939cf43fd5da715e45117dbcd13df93fde683d47179311750f798d
font_02_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1