Malicious PDF — malware analysis report

Static analysis result for SHA-256 48475ad0d918e9ea…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 11:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bcd1d702fc763e3b4e38561d3106bd1b SHA-1: 8b1adadab39e9ccaff2a7ede96cfe229768d9229 SHA-256: 48475ad0d918e9ea54d810272345ece4d9a01102cdde95b18353c574500550fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristics indicate the PDF acts as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://dolphinegypt.net/userfiles/file/guvopon.pdf In PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/38171525395.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c0dee52c---95835020575.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/60028702222.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/40470009841.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/105587857.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/61647903915.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/47676553904.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/sokopudugurinigogeba.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b0edc4018---18649668439.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/105caebb67cfe59b738d7f707c6057d1/62085155810.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6ad6f142a3333c267ad57408403eeb22/94931482375.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24969013d0---95926665806.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/12117516147.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/patobeg.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ku7g4f32cnjf6mo6akae9i0mjt/gulozoxa.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a4e770853---39102235942.pdfIn PDF document text
    • https://activepymes.com/pub/file/xaxip.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/82444772693.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/gagusufobo.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gabomifagisap.pdfIn PDF document text
    • http://m2m2design.com/userfiles/29223625936.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2783c7a13---21987503276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ricoh+spc242sf+manualPDF 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_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 10756 bytes
SHA-256: 59fabbba50afa69a727c34b20fe674a33ff83a9648b593059af30631c239b611
font_02_sfnt_off00011192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 18064 bytes
SHA-256: b51cf6dd90f9b60a50374afdd49c8c04c0e93de2dcf895e4ae4202f8408dbeaf