Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f8d8c9cd257df9…

MALICIOUS

PDF

84.7 KB Created: 2021-08-29 19:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 606015226c623363d074be6f792bbdbb SHA-1: 75bfab66553ce38fbcc64376b15b474ebd0f631a SHA-256: 12f8d8c9cd257df9f05facb22518b430f69d8863f5f71f8a95ea0ca663defa25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=list+of+love+stories+in+the+bible PDF link annotation
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4119fea112---magufanimirasubed.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7839a92f5f9d5f01a9fdb8aaad35ed1e/vonoxowakejalabesumabi.pdfIn PDF document text
    • https://upaspor.com/resimler/files/30858658257.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/nofunudifo.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/pafim.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608889a637434---bizibesut.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4c64a9bed---39677928943.pdfIn PDF document text
    • https://datajournonepal.org/files/78840363856.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/5791ed6f66fd0301d374b68317d8a894/97821867888.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada48170d6---teperitubibinepiwofotal.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/50efa35c673823772dcef8faa403938d/91813310372.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/xavizekuvufelajokiniwar.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/dibibopene.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/81694622142.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/zidirakuxusutuw.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/10893704070.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ag69c7mv37hbg6db22mdu0h9c2/jegejilufekoxaloke.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2f4ebb21297f769a7ac36354512e8f06/31879138275.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/ce2c4aac0b2c46d4c08fa35c3d1b91d8/1693347425.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d513676dd8---wilelojelatug.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdecb09213---16917001920.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/3518939073.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/wovoboreleragax.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/biwijawarixor.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210629175848.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_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 20488 bytes
SHA-256: 5494935d79081b14ec71a33eff725a385858f6f34ac534d7bd6330707d99c4a3
font_01_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 10312 bytes
SHA-256: d20f774e07e3c0a92f2ad2d72fcde2d3b1781ad57ca195bdc336c5154a3a8a69
font_02_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1