Malicious PDF — malware analysis report

Static analysis result for SHA-256 926d93692b4a1d3f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 11:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab7679553319d528a2ce02d7d7a6fb29 SHA-1: bce1cc6f347f2ece37a3aa934cb1de691773254b SHA-256: 926d93692b4a1d3f3a60990892b6817f4aa5311cf8f8362f86990bb1ad8ef0e3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The file's structure as a link farm suggests it's intended to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=how+to+factory+reset+an+android+tablet+without+password PDF link annotation
    • http://holzbau-napetschnig.at/moxitosirinogabowit.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/doranuworov.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/92537850638.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/90983794954.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/65989cdb6a34f22868b2ef3efe2261db/84660991467.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a2c7176a2ac01acc835f146c6037edd8/lajatodonipumif.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/rovefafokimizipawerim.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/67600815762.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/69173304549.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/dajuledupegabovuto.pdfIn PDF document text
    • https://novsport.com/content/File/10110849323.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/wipejariwojufetu.pdfIn PDF document text
    • http://jinyezi.cn/upload/48547317757.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wojef.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/42477979232.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/24005188575.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/12936001004.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161357485999cd---dumikid.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/puvezuvexowux.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/gesafafosajabenarij.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/vodorewizomogudanek.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2d8a1343c66f4bde504e8814d8a67047/sofewo.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-12/210912223415661489w5ealureuh9c.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/23113904980.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/vakujatazedel.pdfIn PDF document text
    • https://km2804.com/ckupload/files/30350717573.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_off0000cb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 17480 bytes
SHA-256: 783e341e4dbd5ebfbb40d172fd7066e1277b76805eb49b08b8995f7fc0ee3d76
font_01_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 11148 bytes
SHA-256: 9f64de607ce6b440c7641cec3eba2b219c382c430d29d9091ebfa79845420c3e
font_02_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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