Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd81b6fa79ead1e6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 12:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20db5a6d56d0d156162a2a5037cec454 SHA-1: dd763b0081770aa738123d91ae9891ae2c8ca492 SHA-256: dd81b6fa79ead1e65d65e5361062e147f08658969c10ecce4b1b87caa8c343f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, and one specific URL `https://laborke.ru/uplcv?utm_term=why+can%27t+i+edit+my+pdf+in+preview` which appears to be a lure for users trying to edit PDFs. The document body is heavily obfuscated, preventing a clear understanding of its direct intent, but the overall structure suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=why+can%27t+i+edit+my+pdf+in+preview PDF link annotation
    • http://bloemenwinkelindex.nl/images/uploads/57584869517.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/82806092337.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fabbfe02bb---tutiperud.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16091c793709b2---19646267248.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/06abad1bef6678ef65750979b07c3f66/21816240337.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/78284315968.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32abab96d6---77942155865.pdfIn PDF document text
    • http://climtech.com/files/files/vogejibukogunefosutopa.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/xewadudazajak.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d7427e5f22593d4d764825c005f865f1/8846688687.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/bifefizapiretexopanodola.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/86645425675.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/wekubob.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/6325950446.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210815_3629D8FB31FD2717.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/vuradukitezelemegowami.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/xapiz.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108022100082842.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/titese.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/fapezabajuw.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/61230051828.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b2ce03abce---69778795524.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/38edae8afffb80e933513c2d456c5a84/60477650991.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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 10844 bytes
SHA-256: dbb0a08d1003d3b070c4f8104290e5e1df62b7d69d628e7a65edce1ed043fd9c
font_01_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 18200 bytes
SHA-256: 9afe3c25b73027755af7c8e1efc2fd4427698801850eb425bc37ffd3054443d3

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