Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f28c47691f9aae…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 11:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 22ccbdd83d530411fafe4677cc7e20b5 SHA-1: ba7b7c0cc56e124994a34d3795585af49e1f9cb6 SHA-256: 62f28c47691f9aaef59bfc126d6abb70da20293cea3491fac80ccab139772693
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, it features a link farm pointing to numerous external PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://materialdeestudo.top/userfiles/files/datalimekobafoj.pdf In PDF document text
    • http://iehyun.com/editorupload/file/jujujoxilepexazu.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/69315439246.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/sipinexupuwomuzonid.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614122a6e8054---jebowa.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/33907755744.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/pisufedugufeb.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/soxerekewifopumepabosuf.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f642d9052eec2f695f40952554498bc3/garilojijoworifuzupa.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/tebokasizukipiwodo.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/34938574502.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/pavivom.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/susib.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/filoromem.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/dnie2acd962apiebuk8rgt2fsr/79589240827.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/97120071882.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/lawitolu.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/34140769958.pdfIn PDF document text
    • http://juha.be/_files/file/3400956932.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/8248991375.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ntod28nk2tgpflpnkblvsboq60/99307555157.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/samizusijimejarozore.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/popokixanituzaxixesasip.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/zitulimemowanoso.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/701d79e589fa7dc470772528b5038c9e/96035216921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=film+movie+appPDF 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_off0000bd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD80 17196 bytes
SHA-256: 00c5a9718c333401c2f734cbbaa9fc9a0e93134de4929944be3a21381793c39f
font_01_sfnt_off0000ea53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 9984 bytes
SHA-256: b7a1837815ea0edb8116918ecb97ddbb5183c70be4e352a23d40daf22276b2da
font_02_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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