Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86af68f4785f6fe…

MALICIOUS

PDF

105.4 KB Created: 2021-09-05 06:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c0c335c5f1df9a71d4b91bbafba4f66 SHA-1: 88db01a6aea2c5f06d210ebe2ca7d1b65538073a SHA-256: c86af68f4785f6fea2a9f2b349aff87d87c435f833b724d055756d2c46d4da44
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://synerhu.ru/uplcv?utm_term=castelnuovo+tedesco+capriccio+diabolico+pdf PDF link annotation
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/nazonisenawakuzulokizejiw.pdfIn PDF document text
    • https://retta-bg.com/userfiles/75151981014.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/tirazadijujukogu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/34bc77a4a7f213feedc9022ba397dc6d/tawuneverugatuwabebev.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f401a9e5f35df6daf7dd0bf0c2da3a42/31884202868.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/a8vtm2jutnfa0cg5o5jfe0hoat/38110173721.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/putasiram.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/21797494806.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/86780011488.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/34174498482.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/40746421172.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/k7em5e1ijj5tr62gcr8id2boe0/38292443478.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/jojurimumovodu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/47a06q8mm27jo55dphtg2tce26/839473904.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119c864d71b1---22180346496.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/81752545616.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/15973273826.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8df90f753---91377330495.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6f33ac577fc7a5658c68bd80c0b5d2d7/11567527997.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/sopowakodiwukesosivek.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160829382083da---97410280012.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_off00013562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13562 18700 bytes
SHA-256: 1d33ff62160c1e567c307c0bdda592db521925b27063c253057d96eb9c0aa0a6
font_01_sfnt_off00016615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16615 10948 bytes
SHA-256: 6e63a8e1fbb06e8aafc43f0184d35d3ef49ebb760526a4fc223609486f50ce3e
font_02_sfnt_off00017f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.