Malicious PDF — malware analysis report

Static analysis result for SHA-256 caeca230c79d077b…

MALICIOUS

PDF

72.9 KB Created: 2021-09-20 11:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 707b4ede34e9686f7308ec1e56b37b0f SHA-1: 914c5498e0672f60708854f1f82cc05585bc495f SHA-256: caeca230c79d077bd49474cfafb898ae0187ccd9da9565aff67c1834df04d489
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://coretry.ru/uplcv?utm_term=monopoly+games+apk PDF link annotation
    • https://marikakozmetika.hu/editor_up/fituzir.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/vugexigerew.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/nuwerefigopovakidadusupo.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/sanabotunagegijawenimag.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/52537329894.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/35668718675.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/s4km43pffu53jj2a8mdg5d214k/noxofinezufujenutiwijiko.pdfIn PDF document text
    • http://rentaruedas.com/files/others/151746598.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/17583008619.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/8188406356.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/guzavek.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/68710382571.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329ddea5faf---5545605730.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/98684617297.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/89704611810.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc039b43c9---getisetero.pdfIn PDF document text
    • http://reflita.lt/uploads/files/dalipabulowuvajove.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/vinorek.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/dovigetifafifovuludubaba.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/92837820770.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/sixupemegaretinetu.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/94052133899.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/21164236286.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161468d418b53a---53442115971.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/pumomepazomuvenefagax.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qqg7i70dpjpmto30imsto3rrvm/kogijefajupasi.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_off0000bdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFC 10504 bytes
SHA-256: 042906c07135b6b6c5eecfc5377d9e53346d0c63684769ecb8bd1e99db7c83de
font_01_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 15784 bytes
SHA-256: 112d8dd37e737426a896bfa349c60fc044e211ef2c94e1af10a9adbb41366d2d

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