Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9580300e440d9dc…

MALICIOUS

PDF

95.7 KB Created: 2021-06-25 20:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5ac1cb5c41bf40a093eac7e7c3aaf37d SHA-1: 8065fbf050ef76dc73543badc3677dba7902db44 SHA-256: a9580300e440d9dc3ac4f5264f877e6ae76fa4b502d9fbeb3a6d17b325c03681
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely serves to further the malicious objectives, such as downloading additional payloads or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://chcial.ru/uplcv?utm_term=python+interview+questions+and+answers PDF link annotation
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/36da542e0462c38c1ee632f69cacc880/91637111280.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/gopojuzik.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/90d5c76114d68b77cd7d40a2f13796d8/lalegekugajupod.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/39497505274.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e416bc4a2---sezafuzitesenimalupaxo.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/1017459721.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3519af023ff1e6f87898a3639f7cf7ae/44128190989.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e92f80b598---20734007723.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/ridapanakupevijuxasusew.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/99002212103.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/xuretadupemomavidatodo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/gemejoriz.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0392bd0f---zudik.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8627e9b1a0---62409944292.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/19772839861.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/p2qd750li2d16i8ssmat4uu0es/73001150420.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/kologidefanibi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12af404ea8---73263895764.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f117f19244---65648676886.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/rewogakovonobo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/90956457c2222e7c86ac9be1389dd6e7/nebujutesof.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/540609a1d7e077475be42ce9fa2ba767/29351788228.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/98877044407.pdfIn PDF document text
    • https://www.truemark.dev/PythonIn PDF document text
    • 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_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 10812 bytes
SHA-256: 79ecfbf398a61789f0e80426c6c8486619c7091ed406fad866a39642a2c0ff78
font_01_sfnt_off000126c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED2 18980 bytes
SHA-256: 34b47c804fe84bc23d5311cd4263397997bfedca838c4a84c7a19fbeb1013631

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