Malicious PDF — malware analysis report

Static analysis result for SHA-256 defa23021127cf3c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 22:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9b8efe348bbdcbdc900b93c4a96f4cc SHA-1: 35e961db22a8289e34e0e27da705de87fe73b3a0 SHA-256: defa23021127cf3ced059c173497ca7a36f1027a66542bac27d82019971e0e1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially harmful content, such as phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=top+war+battle+game+unlimited+gems PDF link annotation
    • https://psihodesk.ro/ckfinder/userfiles/files/4392407137.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2dd32eb4feeb3b36a6caa850ee0fd752/tufaguxuvixodobup.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/48630923047.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1f904dfbc---80200270318.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/wumabo.pdfIn PDF document text
    • https://mentormedya.com/files/32845558599.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/23478249134.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/bupewitijik.pdfIn PDF document text
    • https://agatanorek.com/files/file/26383134155.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/832a50a69882eae60eb16d2546990049/65274052363.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/pebogafefosar.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/79041631258.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/vakutimaxotu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ab32b259---xutasifajenixanow.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489a204b602---37193529179.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210905_8897EB473A819122.pdfIn PDF document text
    • http://demkapi.com/resimler/files/dulugilovetizasufoderik.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/molagikad.pdfIn PDF document text
    • http://szjg.hu/images/file/68833248253.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/xetetegewuxav.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/46b55eca41c773e98b893f686fa40456/70360360655.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161342464b6868---92310825869.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/94064380865.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_off0000b1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C4 17028 bytes
SHA-256: 287727c7c58178bd615fd4b3998779f448363204a66d68faa0cb0ac249559196
font_01_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 11024 bytes
SHA-256: c9a67ecbd952fbbfdda3012a90732e36ecc45d57c78659b2a7a1e4c61f63cf01

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