Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d298965d108a68…

MALICIOUS

PDF

87.7 KB Created: 2021-08-08 06:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f6024da4b56192a99421e14e21134279 SHA-1: 3fd14ca91988c649806cb1793c99d4c50cc63b30 SHA-256: b2d298965d108a68d7cedd1cfddf73aae8152940e57c6bfd9529ca04e1e37930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://laborke.ru/uplcv?utm_term=libro+dibujo+tecnico+1+bachillerato+editorial+donostiarra+pdf PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977fce8b495---pevuselufelazamiwonejuwuz.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/vurobidenifogumabupuz.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/cd84c627571489200ca5515290535afa/23279816301.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/tonuvubamujamanuf.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c54fafc9a---miperipeminis.pdfIn PDF document text
    • https://haidangpc.com/contents/files/53633574180.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/7848709496.pdfIn PDF document text
    • http://fittbike.hu/files/file/votirovibawi.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-8-5/20210805192057132997.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/71885127789.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/22b23d3f643c5af6e37db2af168c4fb0/zajagef.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/48137464304.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/6ebc83c947c2c5dbb337a348d8f1dcf0/77533197351.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607244a23b790---48472380169.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/repofipuru.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/jezetajasalobale.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/nebolasekonimidoxujij.pdfIn PDF document text
    • http://ping-property.com/user_img/files/26035018872.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc48571fa---48322948385.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/tozopuravulominosuke.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/6569673834.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c067114b32f0ccc2a20c017beb4acf6a/fenuri.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c25b4b7d6b2---57446085924.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089999a57907---tisozaru.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/lanusikubemosi.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/sulinujakuposusug.pdfIn PDF document text
    • http://downloadfreefilesnow.today/feed/In PDF document text
    • http://downloadfreefilesnow.today/wp-login.phpIn 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_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 18644 bytes
SHA-256: bb2ea1aab3ab14169dc22f837bfe4b080aee9371bd4bf27d6e6f7b8c60145726
font_02_sfnt_off000135df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DF 11096 bytes
SHA-256: 47b4d3f61d7747c38d0c3393eda5c4654ebb87a2d5afbe417b5cd2a3b8183ad3

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