Malicious PDF — malware analysis report

Static analysis result for SHA-256 b579f1c04d5f3d0d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 21:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35f0c1eebe9147811c2b45e097ee3040 SHA-1: bbec8d20a4c2029b1a89de239defef38bbeca220 SHA-256: b579f1c04d5f3d0d337d0e74c9ebfa8e33c245ca6c3974f8484e83dd56776b80
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains that appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to external sites, likely for further exploitation or phishing, consistent with a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=the+nature+of+technology+pdf PDF link annotation
    • http://creatinglifeoptions.com/userfiles/files/siwapositatipipalit.pdfIn PDF document text
    • http://araonline.hu/uploads/file/28440568088.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/geruzazilakuj.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/patiman.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/62766759238.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/39212414724.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hsjqg0i4sk7gm0a37cugdinnj5/foxasilibob.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa9ff39992---24243594289.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/76964310713.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611f4bab1e918---gosowetoguvipomoju.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/31419742805.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/a7df4h4h3seqlpfdrm5k77icjg/koborawuwixunokuxe.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116aefef23bc---63938674476.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/teregubatesu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ee885bbd92407e2cfb658b7b355094c0/lixebedat.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/17221525565.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/31713140911.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/52320058624.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/jefivebukaraganap.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/dusud.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/bibumako.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/5c4992b024ebff3dcb9be760d7bbfe1e/laxizugixokopi.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/85451795702.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/2a9hv9jdgr2qfkv20hs5u515u6/xezina.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c210226198c---85608614977.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_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 10816 bytes
SHA-256: 1fab22a5743e4c4036a05b18a1192551cd4002f8745b845a6add75f762e15e94
font_01_sfnt_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 17100 bytes
SHA-256: a5b47bd25d0c110847e68df3da4f994e78973a15f6e0e38d21707dd4a992fbea
font_02_sfnt_off000130c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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