Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcf89bf751e10d6…

MALICIOUS

PDF

103.6 KB Created: 2021-09-03 02:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52d5f24f5d3dbc1967045d842019311a SHA-1: f0dc0ff6bc7525ddc122247c266f6dc245dc8d02 SHA-256: dbcf89bf751e10d6f8563f02336ded15bb5b8482c5186c2e30493b54921f2d6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=computational+quantum+mechanics+pdf PDF link annotation
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0bd09e7e9a7326fd97034e313c074f03/13514138618.pdfIn PDF document text
    • https://tipresentoio.it/images/file/nodifasatifiwukikulev.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/kujazufaloseve.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c274d17db---18295410129.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/27575825827.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62cd8c212---godemelo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e981a1855d---dudifexiresifopibodi.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/63446190615.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/60221033039.pdfIn PDF document text
    • http://cutskytools.com/d/files/25560064302.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/64091674054.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/71924660797.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/1864049348.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec57a48e8---51038445457.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/mupaketizisa.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/vigejulozavakezuxuzirawi.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/41235831518.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/54055135216.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb2fcb747e---rufolalaxiwonili.pdfIn PDF document text
    • http://poultech.net/d/files/68476552466.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/28938684433.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae9771098---12383432719.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/25jer504vstlb7j4m3rqv81kp7/givilizixijasasevevawinu.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/41533246896.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_off00012cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000144d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D4 11060 bytes
SHA-256: c76949a175135986bbba5cd016254b01a89af1860b090f7e257f22baa48ed67c
font_02_sfnt_off00015e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E33 19044 bytes
SHA-256: d4f0791b0c74fb519dff9548130bb9b6b131c4bde9bb1e570b7c7bf010c79b16

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