Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfca5c30069c787…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 12:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ba96d2a03b3221a7a3399fe64292212 SHA-1: c21dca0e1d3cb9adaaad3b10729d1aeb25b95989 SHA-256: 8bfca5c30069c787de07a323d87d338cdeaa4a7ca507d93f81e0bda6b96aa4bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a high number of distinct hosts indicates a campaign to distribute malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dbjadow.pl/attachments/file/99790825203.pdf In PDF document text
    • https://scalper.ir/data/files/file/57441268873.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/72222596817.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210621071526_xyw8e5.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/pugopodofufutukibesumot.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210819014301087.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ede0b7da7---99034731896.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/lelofikukada.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/penoregudop.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mah4u78u3p8bjk0lv5o9ql0cn0/sunatirakugemebikefewojop.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/63701d04b2e9d63d82f50b798df34681/17034877271.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/nemepedogifagosupose.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/buxumopuzir.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/73244980317.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5900a78180---8898868306.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7affd471675f779599a5566d6f21cd42/74377297809.pdfIn PDF document text
    • http://www.toptehnik.si/images/56977818649.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2cccc9b5d0f3e895aa0d863ba1defacc/78710887747.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef29dab653---36414670476.pdfIn PDF document text
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/fekuligukunituvesepazefob.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cd08c420e50---15615174877.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/dajatudumabedufuwuw.pdfIn PDF document text
    • http://herbexindia.com/ckfinder/userfiles/files/37255337940.pdfIn PDF document text
    • http://zimmerei-possert.at/tuwipataki.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/4avai5lkdeu4o42fid4m7ucnr3/31063530585.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9918285d905c3eb698fe6b08d87bb8c0/ribifizukeraza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=eclateur+electrique+pdfPDF 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_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 10448 bytes
SHA-256: 920cf5d057439e8636281e4aecc0a5ce820235b802c3ce3e52428fdae5d34ee3
font_02_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 17496 bytes
SHA-256: bb325412f121f03ec8123a5faca5296c0c8120eb37b026e6c599dfa315be4b87

Open this report in the interactive analyzer, or submit your own file for analysis.