Malicious PDF — malware analysis report

Static analysis result for SHA-256 e828415b42bc01e3…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 07:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 200620ea1618ad96845c6ddc3a916c6f SHA-1: 5fd2cb7ed722d595fa3f8c58cbdc2e41dd37721e SHA-256: e828415b42bc01e38fe06ed53fc81a34368f28b4f74494d1ea1b21da43bea6ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being distributed through these links. No scripts were extracted, but the structure and URL distribution are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wastran.ru/uplcv?utm_term=story+elements+worksheets+2nd+grade+pdf PDF link annotation
    • http://rld-carbon.ru/file/89480989460.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/vozipedet.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/bumadibo.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/5025038209.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9fb6c22e8ba9f1575adb536e086650a6/81122117853.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/80fe8e4c0167266201852351e3015405/tufozobubabipomefagogarub.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c245d724505---noguxinimepi.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4eg90hji3ue9mq5loilun58eun/rejimeki.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/92c25e1f7d963c7c8b095080f80cb94e/31600399176.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/bawupivajasixiwiwavumunir.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2f105633---feziralasuzutawokuputetal.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/59442712323.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/zesalok.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6200cc8504---95734863826.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/85325957767.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/12622117749.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/76876929531.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/38245577967.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/cebgsbi6nm32nogi6qo6lguoj9/57764426616.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/zujokufudapivagipukemofo.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/zezitosuvulapejif.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/85028854943.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/5296d6063deae9ae7d0c77a0c92f2c2d/95036989014.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sokawemumubafi.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/73448400286.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd9f3aed7---38284212720.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_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 18304 bytes
SHA-256: 9b80d26dc9f43960106d5533b12e6046709af158f7ee277b205305db6afdda15
font_01_sfnt_off00011265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 11340 bytes
SHA-256: ff360a90a9b9c082d957f85a13823a98125379de9932846e5f9092e6820755df

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