Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d6f0b16ec94bcb…

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 18:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ea8c6bd41459266e034e596527c714fa SHA-1: 506cde437f03a3763fec024af470fe5118686274 SHA-256: f7d6f0b16ec94bcbfabcf6b90c44e04898c51fba01226151882d1b1488e9153c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The primary goal appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608262f0c15bf---gasiwojokigig.pdf In PDF document text
    • http://tuclubcr.com/campannas/file/temagijewiwodazi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3cabc085f0dcd0b1ed33abf0d14cd561/gujapusipomozelowedeti.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/gejc5nc83pnjik0sechu4ohqe2/tixilotezuzalinu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c74103005---53257359285.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5964033373ce0cf8d755465964d117a0/54836802489.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609016b8db9f7---zediji.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/70201279214.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/34563543997.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/78289b91f8f9dd4854b2f41a5a7c6eae/pulaf.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/zidafiselebajilogujun.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2c9356f0---noxapubilode.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/79449568072.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/83ab41e9a76d6d0409f26e9b51ce750f/tuvujexep.pdfIn PDF document text
    • http://teifsepahan.com/files/file/wikukavumirukelexelew.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/benamuxoduzanap.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5567f6b29e69382c20834a5bc4b890a8/95492296043.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/84197281060deea891aa51.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00d80cf2d---87251548431.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/95585023898.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d459efccddd---41584351471.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5d9d2ab80a149780fa120de31f8bf27e/29419715598.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857e745c2ee---zegulaborajazimogenisu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0a3a930a---perorosogelefidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=a+great+amount+of+synonymPDF 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_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 10612 bytes
SHA-256: b76b1c7c6bd55a3c89be40730786f6db5557a072d16788b5b05122afa3db0744
font_02_sfnt_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 21768 bytes
SHA-256: 5c0e6913c8b6962796d55896ed9a408000313487f5fabc1191fb7eb9016af235