Malicious PDF — malware analysis report

Static analysis result for SHA-256 843b20641823c729…

MALICIOUS

PDF

87.9 KB Created: 2021-09-04 01:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3aa35b5c4156226b357c4deddc5aaa68 SHA-1: b24dda87c5adaed44308d049a1d1856f5612124e SHA-256: 843b20641823c72985a3891c114ff018a33c8eb069ea92d236bd4c1cb4e4623b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS upload directories. The primary purpose seems to be directing users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://cualuoihoanmy.com/uploads/userfiles/file/fuvesajowugepisipuf.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a24eabd9e1---tizezunubugabeluzuxo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe34ae4b9---kujug.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d479d3b3---nubotezatupa.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6923c93c5fd4c504e37780905dbb4f75/99319980237.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/keveke.pdfIn PDF document text
    • http://promador.pl/userfiles/file/nevujatiwinevuwum.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f644e16751b38cbfb3c8ec46f319c8b4/59915457223.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/65556801043.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/13556835871.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/badatuzu.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/1240784788.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/noxesupiri.pdfIn PDF document text
    • http://axwelindia.com/uploads/43087588411.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/90750243951.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/28707511153.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/xavevijujelida.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16114ce33e22d4---16034173812.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/fcd5b485a4ed513e93ba8d36da44ee22/jisotopuwobusuvawetofup.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/fakiwubabozal.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/04c4ab085a6978de7d9282f25ebd311b/muluviwonuj.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/97005019954.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/nufuxuvinozatenajexoxuko.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/v7fentsb3pkht93gb5uq8e4m88/timeduvebuxufugekimude.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea924463dd---65643900812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=buddha+vandana+gatha+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAE 22884 bytes
SHA-256: 215e1b3c7eea61b6962f6b109ae32a5eeb1e153cf72debf78950a162fdf52b12
font_01_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 16752 bytes
SHA-256: db21b4c7e539ae6c51b694996d36991e5a0e71a406de6f4335bda1a0f9f3f3d9
font_02_sfnt_off00012164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001397b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397B 10592 bytes
SHA-256: 073b42bf084956d26d6ecf5e7ce02afdc6b6cbdca3c6ceaf2802a265561cc048

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