Malicious PDF — malware analysis report

Static analysis result for SHA-256 c201c5fdc199e494…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 19:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09ae0284dcc3da3f8a1a3ef11ba96720 SHA-1: d9b3c216ac49efec0ee88a20b7e901ba3d9e4216 SHA-256: c201c5fdc199e4949358cc383a4b6a0263e092483e7a68300b030ad972b64cfc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=best+free+manga+reader+app+android PDF link annotation
    • http://ayrh.internet-match.com/upload/files/vetuligabofadakerezanotil.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/7490730054.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/75016879324.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/xofodaxadiloge.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210909203553_wf631g.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b9d5d0d7e---50493281303.pdfIn PDF document text
    • http://www.pvvc.cz/files/xokizaw.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/46480577366.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613464fd0a4c2---vovarividigurenobaz.pdfIn PDF document text
    • http://klaaswester.nl/img/file/wabeni.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/45946083685.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/gawaratamunekeluku.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c95b8375032de9ca745c46c513c554f7/27113650846.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/9749625273.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/84302584350.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/59448089881.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/93658207458.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/bubiporolezem.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161361fc67283a---27385248020.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/76659312562.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/24069440908.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/7050743621.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/66138424085.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/52380933155.pdfIn PDF document text
    • http://emeat.ru/var/files/godemukifutevamumav.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/zosipurozajolisabuwe.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_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 17604 bytes
SHA-256: ff7d662fd154775fa677cd055345210ee3eb1b43bf2d4010099516e10d4ee238
font_01_sfnt_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 10848 bytes
SHA-256: ebf41bb124d48f202d79de3e3100b027427f5bd0ec979faab628cd9ccc38e7ef
font_02_sfnt_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1