Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1c46928aa82921…

MALICIOUS

PDF

93.2 KB Created: 2021-09-03 19:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5d03d5ac71348ef06cf40d9001e90e94 SHA-1: 2ae2705cfc4f5276b6430b092ae2bc35af24cb4a SHA-256: 5a1c46928aa82921700add62586bb82da51d07e02a45b63a980190ba007a6588
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090055568424---worudog.pdf In PDF document text
    • https://prosperitas.be/data/assets/file/bekaketuvotajewenemevoti.pdfIn PDF document text
    • https://mfdesign.hu/files/file/96852648646.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/7e4331a34efb974799f575104038b9ef/56809207879.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/derugogidukegiludaperalum.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/603721789.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/varodedejota.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbd8a37cdba016fb5aa6b19cc1431442/6102784857.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/15833579792.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/89885995673.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/57977649219.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/35584624424.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3c97fa2b74f691e3dc1c8256b53cf8bc/81991522879.pdfIn PDF document text
    • https://argumentua.com/i/file/wikesisijegenewuxiselem.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/52422817825.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/linekimuja.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/siwowuzobefewefotojekeg.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/44995513632.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54586790037.pdfIn PDF document text
    • http://mlight.cz/archiv/file/55431309356.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/miwoxasomopiro.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609860d6dd75b---xugejugovi.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/65993505797.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/mosarubotevijufed.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c217cb07c---83977584694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=neato+botvac+connected+manualPDF 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

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_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 20220 bytes
SHA-256: 4d2de27e0fd9bc0c63b699267fe4da1d5ae2d19971ad7a4b5a06289df3b3fb99
font_01_sfnt_off00013751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F68 10452 bytes
SHA-256: e203c5bd18ae207e253c2474785cb47266c39fe5c684db4af0cfb622d1cec249

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