Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90a0939968fa6bf…

MALICIOUS

PDF

95.5 KB Created: 2021-09-12 00:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4ff5a5e9ec1424799b8b5f3b329c168 SHA-1: 517319ef3b25df8ad5a3b37e361b453f0646959d SHA-256: e90a0939968fa6bf51e3c2ef5edff11ccc1512a4021675ae792a664712bc4ec0
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. The ML classifier strongly indicated maliciousness, and the heuristics suggest these links are part of a scheme to distribute further malicious content. The presence of multiple links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • 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.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398bda7a92c---80645840208.pdf In PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/binapirevotodazikow.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210910032720_lzp6gy.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/27075329602.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16134c1c43dec6---noloresafaxuromuniwedi.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/jodigizakepi.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/nomubuv.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/jatitafulejagisitatawa.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/9548399382.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/waxuf.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/47117968311.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a73eaba449---15425838922.pdfIn PDF document text
    • http://livestocktool.com/d/files/vararefuja.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/tuvepalukebulugagik.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b6d0791cf---2280926399.pdfIn PDF document text
    • http://terrietanaka.com/library/files/bogefavevasagurugujiwu.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/xotiwunosezinaru.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/pakorirawokoxefuv.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///67034313907.pdfIn PDF document text
    • http://wsm.hk/images/files/86866821892.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/31041964722.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/5256726522.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/65215378869.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210905000302.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/tojopopavefefekaren.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/dobejefobapojisufukifaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=it+chapter+2+torrentPDF 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_off0001117c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 10236 bytes
SHA-256: 8731b75da172daf79f2e52347e95ba57278a88816c74df20245a3c1048d69288
font_01_sfnt_off0001287a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287A 18288 bytes
SHA-256: 040a494c09edbe04248caa2c2edaa5a62ccd2dadce866ac20fbe8b5fc6dd1856
font_02_sfnt_off00015837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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