Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ad59584de7f6bc…

MALICIOUS

PDF

81.0 KB Created: 2021-07-03 09:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1a368158ead1cf3bd235b8e4d747b18c SHA-1: 26b0846e91758b1cbba5f1db3b307711b25ff117 SHA-256: 58ad59584de7f6bcf5878887095ed45ddaee4bff7411bb9f66e8a7c4e0e45f90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It functions as a link farm, distributing links across numerous compromised websites, likely to host phishing or malware delivery pages. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://beadsandsupplies.com/images/file/61397689398.pdf In PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785e02b4d35---67383999897.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160793d703f6c4---75752166901.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/1561132ecedb7f7333716eadb74ce8c7/pogofemewujagevutatusuzin.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/31253722193.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/465b295961990d0490827ba4b7cd6ef0/todezomojojeginerazeku.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dee8816a09ab50891f77dca985ffeb6/86282721726.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160869dd22b4f4---mexifawavefega.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/ripekilagujazusuxuf.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/63896878697.pdfIn PDF document text
    • http://www.nomorcantikspesial.com/file/zogotaxakidur.pdfIn PDF document text
    • http://leton.pl/userfiles/file/81752807656.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/bafemikekolerozofupobapok.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e95d7ecf5d---temozeruloxedoso.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/671d8a98fe5446abd6a2bb32a3be7826/86789610358.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/teseza.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/regija.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/gi76qa37dh522oe85rq2c4un0s/tuvuxedotaraz.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3828068b---72383538854.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/afa5b2b4f11cc96b323b28a7b4d944de/42104148576.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/93884263359.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088542659d84---97713467929.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2196aba58a---67429764675.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608faab641f0e---nagarakevakalabebofapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+can+travel+around+the+world+while+in+a+cornerPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 10544 bytes
SHA-256: 748769d142c58c387af3fd17d185fa5477bcabe50deda937f33d5249c12b6e9d
font_01_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 17104 bytes
SHA-256: 3f73db9e775bb1ccf3c595e01d7cd023eea0c51946542a1572adb12946b9c3ce