Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e536032d6d370f…

MALICIOUS

PDF

88.8 KB Created: 2021-09-05 20:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b917008ac001196ee2f0c566caff70fa SHA-1: 7cb14723a498af64badc9740afa6e8e694e26c82 SHA-256: 66e536032d6d370f19d0708b27c8833006413e16091531c9bd686043d323fe98
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The primary function appears to be redirecting users to potentially malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=cervical+mobility+exercises+pdf PDF link annotation
    • http://museeducuir.org/upload/files/88797933705.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zuwepoziketulikidajop.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/kulexinubamuferipuxobu.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814ad8a6adf---sinurewusow.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607021ee1cd7e---zumavovaribadoxapu.pdfIn PDF document text
    • https://digireg.it/upload/zatufafisiv.pdfIn PDF document text
    • http://nenorm.com/files/files/27061526252.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/83ca3050ee28dcd8f27c5122f0779df8/56466632576.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/vosetitebejabes.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/33731617803.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/xebugedaxeriz.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/046od5le1n5m00t5n8mhrfm3j0/wagedirizujanolefep.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/juzulevugatekadoz.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd85ab4fe9---91569534852.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/76354590079.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/xufofunuxakak.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/tetusa.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607557725db65---68642980997.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/lagonuvonomutofa.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///47043083214.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db423028c6---53288377165.pdfIn PDF document text
    • https://media-get.com/userfiles/files/vimewawunufukinojegenezo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ba2922f4---6709528214.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210810080832.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 18828 bytes
SHA-256: 1bf90441e8a670c06c028524ccf344deadb1c922125a35179fd6e6fb523ee34d
font_01_sfnt_off00012369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 11132 bytes
SHA-256: b157307854c5fabf27ebb5b4709f36fd40aa2b449c0277ecb876bdcf4e132749
font_02_sfnt_off00013d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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