Malicious PDF — malware analysis report

Static analysis result for SHA-256 030be93ecf03b327…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 17:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b93953add50543640a615a658b2de9f1 SHA-1: 793e55ef910537b8f00d91ee5967911042f80b11 SHA-256: 030be93ecf03b327f790f1f28e05e9f341a3273349e3014b5df0b129b5b5aa60
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3e6f79b048d23b1ea1aa0cb06a28126c/sodujoposi.pdf In PDF document text
    • http://argyleliquidations.com/userfiles/files/nemekepubitewanazemop.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3eed2cd2c05c653903eea4b4b6cd2c8a/zovejubosop.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c1c51225e---85014491551.pdfIn PDF document text
    • https://harmony.im/userfiles/file/puxafavawowa.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/8676615460.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/90213959380.pdfIn PDF document text
    • http://yuha.be/_files/file/kobedimesokikukakirovijak.pdfIn PDF document text
    • https://tele-video.ru/upload/files/gowegofarodabonog.pdfIn PDF document text
    • http://bienbao.org/uploads/files/89595920860.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/80335592599.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/wabunixifudo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161364d87698b6---56835816641.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/54246461453.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/fagafujifukezamir.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/70202440134.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/3693890537.pdfIn PDF document text
    • http://spiregene.com/image/files/20210906_080726.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/92640591056.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109010526107251.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/98384794186.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/67902036683.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7b3d67df---mituxeduxakomifegipuxiwi.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/64009874619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=jackbox+party+pack+5+apkPDF 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_off0000d245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 10400 bytes
SHA-256: 0fb18160f1f7ee45d53d45812ba5cffe5aeb61960d1403a676152dde38d52882
font_02_sfnt_off000101f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 17744 bytes
SHA-256: 1099f7c3db6baacf5b8b1e955e4e84698646edf3c9b14264f6b208b343b20e7d

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