Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cb27746210123d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 19:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc793f1c3c1d5b3da1d7508a0e1274e7 SHA-1: 8f59d66ded016211b1589e6cc8aa37a81d02cfc4 SHA-256: b9cb27746210123dd5de966c927f01b3e7e290f250b8ceb092032cda2ad54a73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. This suggests an attempt to redirect users to malicious content, likely for phishing or SEO-based attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=orient+led+32+inch+price+in+pakistan+2021 PDF link annotation
    • http://cheers-gifts.com/userfiles/bosowojat.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/mabefilokukajabib.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/pezobimawu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1da96c7da---romekewevusana.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/47374929803.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/gugobumovoxowawogunejuso.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/xenimamodoxevonukamazabat.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/78694409491.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/48168064004.pdfIn PDF document text
    • http://www.moyekolodin.com/files/65619407583.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/98783228457.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/59787901400.pdfIn PDF document text
    • http://intertribo.sk/files/77436752531.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/60822125666.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/29967426372.pdfIn PDF document text
    • http://belean.pl/userfiles/file/31663984182.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee10322db---38046925129.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/86668037498.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/bebibupolava.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ce661ff7383f521f317c0e67dc8bb130/basutotitoj.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/rikekusifexuf.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8a0a932eb---14193609318.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/biganugufonizirosilobufik.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_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 18696 bytes
SHA-256: 92b2a283d573d187be0e8a28ff0923e30f85d146ccfbf1f4adcbcf12c87db65f
font_01_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 11076 bytes
SHA-256: c78787e18ad4e45c9970fb84eacaa3a3c011fd43ccb51b95e82679487caef9cf
font_02_sfnt_off00012739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1