Malicious PDF — malware analysis report

Static analysis result for SHA-256 457c06aacfc78147…

MALICIOUS

PDF

77.5 KB Created: 2021-09-18 14:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e05801e98228987002cb5f200cb4710 SHA-1: 4afb2f14fa10e51584722f5e1e713b98b36f7adf SHA-256: 457c06aacfc781473bffe2686d9f81f74871b65dcfd8b5c00a64ceab610a633f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, including a link farm on disposable hosting and links pointing to compromised WordPress upload storage, suggesting it's used to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=love+and+monsters+vf+stream PDF link annotation
    • https://megashina24.ru/files/files/zazalemo.pdfIn PDF document text
    • http://webbuilders.com/files/file/56249392607.pdfIn PDF document text
    • https://premium-house.uz/images/file/jesafuwak.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/14844429865.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/653db15b4c23864ad50a3f3c1268b444/45411988118.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/117f99de34f93e9edf98e7e6995fde84/87847784772.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/41206323596.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/fubibabiwatusub.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/liweneni.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/13796406339.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132f37725e47---suxofekejubid.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161339547820c1---6243084251.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/retexewumuza.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/66087830160.pdfIn PDF document text
    • https://festacontinua.it/public/file/91244781959.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/tanoxemumike.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/dasigalopezeneji.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/76735624822.pdfIn PDF document text
    • https://bawauang.com/contents/files/27878371492.pdfIn PDF document text
    • http://debten.net/UserFiles/File/96748290194.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/malogaduboxajipemew.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e972d750---20030080125.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091108192533.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/31688178546.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/gomazagobolukadejelanet.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_off0000c97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97B 10400 bytes
SHA-256: 44938be939f8b45f00e7a9f9bbbd80cbd3839c90200e095daedf26c04338aa51
font_01_sfnt_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 18036 bytes
SHA-256: d399b4602c7dcfd8d9bb415d74fd3e16e008dbf3dbb83c4a2555c5a0e1b242ff
font_02_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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