Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6b10d7541c0598…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 07:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2999ec15b4627d3fb81cc78bcca8a7fc SHA-1: 0cd7d366cd47a97b6ee2b806c9faa896e5217ccd SHA-256: 2a6b10d7541c059834db3663ae19658beab54373c75ee336b3fd3c78937f3d2e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be465bd3128---kisamifolek.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9129555fb129d7a50eedcc5fcd385e85/meterofijapufumimazubegu.pdfIn PDF document text
    • http://accronline.com/userfiles/file/pilixajemimudezedamamo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ca0db2922---fopuzorigowigepefel.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/66582449924.pdfIn PDF document text
    • http://zubrcup.by/files/files/femefanidefagubedotirufe.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/b8b213e736efc1d5a189c0c3b400cc2c/76403439824.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/vobosufadesoxipe.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/vedufibokurekozibu.pdfIn PDF document text
    • http://air-ned.com/uploads/files/90219460828.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c396bc7e37a---18815505131.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/dejiboviga.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/5429209259.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074805258ee1---97901763718.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/93154301528.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210829085350.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160709e956c749---pitevev.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/37732619565.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf3471acd---buwuboxedovowakedonif.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/70840170742.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/36350396253.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/funoterexojami.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2ed1b8fc1dd5e1f530153310e67ada6/59633858205.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160713cc27ca66---miruwexodubod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=present+perfect+exercises+upper+intermediate+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_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 17640 bytes
SHA-256: f343a6ff160b8e9c645dc9606faa4e30c8403260c11ca6a5f695097989456615
font_01_sfnt_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D1 10816 bytes
SHA-256: a234a618f5887cc351cbc02745cec590fe7f048047d6a28c4ca8fa07b25f94e0

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