Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a6c57a309f52d3…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 07:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 471a6e7d0bc8f483dadd07e68422e7cb SHA-1: 7f1805f74f3f15d7c6eef9b52b616bcd4cc2f0af SHA-256: b9a6c57a309f52d39ffb6e2ce6dc7fa4969b5ff2a74e10e4388109448d195123
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://leprofit.ee/cmsfile/contentfiles/nodadopi.pdf In PDF document text
    • http://rajhansnursery.com/userfiles/file/73461494063.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/kabamo.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/42318015078.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/94441192404.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/mafarezefedokixupisezez.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163148627323848929829.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/18766495061.pdfIn PDF document text
    • http://sjhtractor.com/d/files/mupapulopisivo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e9cef7d6---49463905583.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161390ebb06723---38885596654.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161316c920bdf4---nikofisibavoxuredazorej.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/losupaj.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/pifekipixe.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/guwigonidosigajof.pdfIn PDF document text
    • https://10fci.net/userfiles/file/71623685428.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/71422053493.pdfIn PDF document text
    • https://kapefashion.com/files/files/70269483820.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210909093214.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/55705497025.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5349c6378---niwukibenuguwegag.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/bedenodad.pdfIn PDF document text
    • http://mamam.by/upload/File/file/83407598984.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16130036d8bd1b---dejorevidenapoxadofusex.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/42397202941.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d21adc5ee0---baxefufefagiburowidemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ben+10+generator+rex+heroes+united+full+movie+freePDF 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_off0000bfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC7 11296 bytes
SHA-256: f051d652f0471cdbc28ba440d52f36f6ec284856f0734b6227e6fccd2b5199a0
font_01_sfnt_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 16820 bytes
SHA-256: 66e91f7a391f772400990cc31395cc615bc65132154c0f4e30219b7ee6a80e31
font_02_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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