Malicious PDF — malware analysis report

Static analysis result for SHA-256 470ba0493d26a33c…

MALICIOUS

PDF

154.8 KB Created: 2021-08-07 05:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c84692d98f0421f7cd426276d4c852a SHA-1: b8ddb75d8034093d1fbc14cf187eea1d403c86ed SHA-256: 470ba0493d26a33c1f31bc5de45413fac3321aa24d44e45fd7317df1ac352dd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the links and the detection suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9538

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://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b7a8a197---nizijuwoweso.pdf In PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/63615837847.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/mujimer.pdfIn PDF document text
    • http://polkovnik.su/upload/file/91312236670.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/37194577285.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1e7547af42de993fd63964ca6af0fa27/91661037721.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/bonamopiza.pdfIn PDF document text
    • http://geose.ru/userfiles/file/79050803048.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e8440626975dcb52cf7fe19b5a063e17/wojupibosofexerujamamojuk.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/42592281219.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c54afadd939---kupojuv.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/eoajaleqmdaj9vgckg7hk4eb8a/58144417612.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/224ceaf8fed1fc99fb9421d1bf3f9b5a/xawafuzuviz.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f3dcd5096f1518c04afdc437a39503c0/6317876560.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/warefolutajipipisamaga.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959afc2f131---1324090500.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/sezoxidipobe.pdfIn PDF document text
    • http://mobiliteit.nu/files/72972744221.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70d0a7f107---30100467600.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b848bee9eefb1d5f197d31a3cc1d2d4a/51072260770.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af77a97e105---vatasomabefarugid.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f3dbae72---62624961514.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/29840129523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=10000+kisses+emoji+copy+and+pastePDF 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

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00021e1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x21E1F 22312 bytes
SHA-256: 4ead64b4adaf5b27fe12e2f819ddceaeea7bdbf4de3716f1f351aaec1fcbda31
font_00_sfnt_off00016bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BBC 10944 bytes
SHA-256: 02b568d29b0abbef0f51a7d596ec862d8c7e7c6d01e8bfba4ef2509ccef2f0dd
font_01_sfnt_off0001851b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1851B 9676 bytes
SHA-256: 1dfa21b17fdd6590ff419ade2785cce741fcc243e167de0ab1986460673ebfbf
font_02_sfnt_off0001a6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001bed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BED9 34144 bytes
SHA-256: 53ef53b3c21723531b8151062e2158b89ab88d371d1ac992f37772bcee801993
font_05_sfnt_off00024745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24745 8952 bytes
SHA-256: 084aba20f45b3af06b7ac479f9c47f2f4f04d28e681e3ec8c8cf5ce34a72f99a

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