Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a1475015a9604b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 06:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: edd27c50984d2a3abe5d241307ac4737 SHA-1: c241ebec04fb9652ba3c0369534ffa59659da518 SHA-256: 21a1475015a9604b6db5dfc51a6a067835492f0fa12285f353925a6ee402aab6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://speedwayinfo.hu/uploads/file/dujinotigevadetalujava.pdf In PDF document text
    • https://noticky.net/akce/fotky/file/84366937405.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca445d651c---zikur.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608223753ad83---mizugu.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/aa2d4578a86b7e984287f667553d0cbc/1674169673.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a52133111f9ddfa0fef8610cffb9e13a/37992948221.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/cn9ua21t0thlbctr0ineah8cuh/71176529966.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16091043546.pdfIn PDF document text
    • https://baptistfriends.org/media/84177782794.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/48730008270.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8hhs6fuc2k51jj1qfl93qlf29c/dimed.pdfIn PDF document text
    • https://blokhol.com/upload/files/rowojilata.pdfIn PDF document text
    • http://goldia.cz/data/file/65604389099.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/kunanujimuzibonivoge.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/2bspob3dq6qicoi6s5jaicu0t3/xemovev.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/nemit.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/debujojizudupu.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/kobawekupuzekinawadawen.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/28774447444.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/fikiwasubawe.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160850b90309e6---18336724783.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/xamog.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/jonirizeboruforimulavej.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/52804576906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=twin+screw+extruder+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

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_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 10536 bytes
SHA-256: dc80103044e10e0c73665b1fa9cc559a0f3c9da5837cd6a8ccf9c08265a7916c
font_01_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 17596 bytes
SHA-256: eb590e095e6c816efbbf466cbaad2ef9baf45b346f033d7b8fc20f00871bc435
font_02_sfnt_off00011a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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