Malicious PDF — malware analysis report

Static analysis result for SHA-256 455381c345b2c86a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 11:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b1e35e233c01ab3194d835900a8ce22 SHA-1: f8167f403438e7533813c2048500e9cab5b65b92 SHA-256: 455381c345b2c86acefb97c4b7ff1695c00c60b04529d1f3b48efd70e7dbbe6d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that these links are hosted on disposable domains, suggesting an attempt to manipulate search engine rankings or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ab6896491b8e778797bbf90d523d7761/31401480105.pdf In PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/kotibupenerolujogixog.pdfIn PDF document text
    • https://coluer.ir/documents/file/xijimokodufegusebikab.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5f3c93407---raxoraponon.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/pazope.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/19070952500.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36091366477.pdfIn PDF document text
    • https://soechi.id/userfiles/file/35856137765.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/22463518672.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/mozofidumibamu.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/tonoti.pdfIn PDF document text
    • http://afro-safari.com/upload/files/luxabevonijilalixametari.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/mawukokadag.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160db1cb1da11e---86574546821.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/pezodofebufuruzetoxawo.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/9009460317.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/68ffce5b0f49886f5b1600a6aa21cf68/40966977279.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6fba45356---59784261424.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/zusakamexuvit.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/f16352c9002163546d7b1efdb04f35b2/pofibenorapowepadodebad.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/37278565768.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a22c89c42---fezem.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a82443cc1---wenedetomegep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=caring+for+succulents+pdfPDF 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_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 17996 bytes
SHA-256: aee4e79b5b0d1b6006c1c168df26a89be31b9f2d90468a9935e9eebea793e015
font_01_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 10928 bytes
SHA-256: 3c05ae4cd60467915eeeb74a69fdc1eb4e82edd76ffd72a3aa29a697f12d2d6b

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