Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcfdea22aa4f8cc…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 07:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8419fddd61da4d8ea47e1333bf13be1b SHA-1: b8cc21aab964461da44330092d0bdce868ac06c7 SHA-256: adcfdea22aa4f8ccc91d9cb69719285d14f3cd23ec1561a2a7a4357a448da9c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=tipos+de+energias+limpias+pdf PDF link annotation
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2119beca7c06ac9cfcea20da2c6029a5/misumabatosonafeme.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/56008159547.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/52319411188.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/27148987311.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/44630013743.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/69794734210.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/gelozuwuxarupalereloker.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/fukubokali.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/ruzugukemitemurosajig.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/49386856978.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/416fc331c4043a8ee6f6abafb6dff57a/legezizobelidoberum.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/39744600674.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/9307462165.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/xiluwowumugijoxatetujos.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57ac376878---napebabenoxalepuk.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/18837750234.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b3b8a9959a31375a134aa5b6683b22ea/jinuzota.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/rujuvaxatajasajixa.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9963f95f---63163619649.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91f4222ef2---87915614462.pdfIn PDF document text
    • https://kopari.hu/files/file/76225841476.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5mb07ljrcrcn3msrb1tkagnis7/85352627088.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_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 10708 bytes
SHA-256: 38eb256ad43a1028b5c1536f3aee8c62be60fef4480258174f99bac5c9508601
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 18300 bytes
SHA-256: 1e860b46156433b94b5cf2c35d4a1edda19c979d6b413b67aa15f3079ddb0de0

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