Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed81eba65f06f4a…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 11:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b4feffda4f495a164ba2fb82ca7b157e SHA-1: fc19926b8c0e539862f11621c10385c36a7fa66f SHA-256: 8ed81eba65f06f4a4cf7f7e9f5490001293afb42831526a9852490286a7e332e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation campaign, likely delivered as a spearphishing attachment.

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 https://garglob.ru/uplcv?utm_term=linear+equations+in+one+variable+questions+pdf PDF link annotation
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abc94dc4d75---zawigirukek.pdfIn PDF document text
    • https://iohrp.org/f_files/files/pebiwiruvu.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/xapunulelejakagorelujuga.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e44f37572---37405264556.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/90174653304.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/77461473361.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ee319434d---33978818004.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/44700973631.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9454dc6da9---xaxobusewoko.pdfIn PDF document text
    • http://24cvety.ru/upload/files/selaninixepu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3a022068b1dae30c9f85878fe45dadaf/givixafepuj.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608708452d27e---71560897534.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/wimeremadutores.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/4913a683bc93b9f113489363c7efa710/pisimi.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/11820004862.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6eeb7868b4cd9a7051fc08283df000b1/4456593012.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/g70rtotrbpims98p2mpf69vu4u/51293636725.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/11676ef1b51adf881913b4def3c04d8c/20782275744.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/40401564512.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/viwodomuderilizomasoli.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/vowalovifewuxorotekag.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ccb47fa537200bbb045800f465b58ded/95282297918.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6a8ad780---biletumivakatudi.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/64093279224.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/iv63ag9kuh4159ghp8ihhe6d94/10260347233.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_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 17724 bytes
SHA-256: 9d25652e7bb8a4a3b095fb6e1330f02531f942adab288b1a24fe00a806dfa2ef
font_01_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 10900 bytes
SHA-256: c63a815cd95e20f854c1d8010fb45fe78fbea4698e8fdec955b45703b19239eb
font_02_sfnt_off00012dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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