Malicious PDF — malware analysis report

Static analysis result for SHA-256 c235cd18141a774e…

MALICIOUS

PDF

90.6 KB Created: 2021-09-07 00:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77cd1047d143ddd83fb00995f1a634eb SHA-1: 6ced699bcff9d16406bf81d4382e597fb404d7f4 SHA-256: c235cd18141a774e97ca768a89ad5790822b5f06fcd0693f4c7a11d3c9cc07e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a potential phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wagaskar.com/media/51989245422.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095176592e1c---35592220275.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/49760119879.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/jubofabokag.pdfIn PDF document text
    • http://yoron.net/up/files/91117432907.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/67037734441.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/toxadupu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/710660593ea7e5e47fd98cba8173695b/soseputujiwanoxep.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/gasobe.pdfIn PDF document text
    • https://soechi.net/userfiles/file/74744947516.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/89777237510.pdfIn PDF document text
    • https://haidangpc.com/contents/files/pasakolebememat.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/3739271252.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b93b9cc77---redigiwuvatefefoxu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c114999c98e---fawosebupiku.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/sixuwefudekejejogemi.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/13891344280.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/karexokasubudumonasaruvis.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083acc5bab8e---wupowitobowilew.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3abaae173---50274437129.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/kibakomazavatoderobaw.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/dekunetukipoxatesadupa.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/55792302139.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/10010540472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=manual+endnote+x7+espa%C3%B1ol+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_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 22672 bytes
SHA-256: 8aea4dc21e31add2fb373ac7d7322d11083f354e73039483dbdbf8995871cbff
font_02_sfnt_off000141ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CA 10748 bytes
SHA-256: f6ea0646cd68459ea86f4116e01a171d44149cb24eb9a52f5dab1e47f51dccdd

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