Malicious PDF — malware analysis report

Static analysis result for SHA-256 744c9249a9f454e9…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 13:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a90293b707a284acb6d7377e9be05f3b SHA-1: ac9026d8e8821ba3adfcf7ab14a674633c61b89b SHA-256: 744c9249a9f454e9123c04e40a61deacb00bfff332aa9f5ddb81f99951a2eaa4
176 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a malicious document, including malformed exploit stream lengths and a high ML classifier score. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://cosonnguyenthanh.vn/webroot/userfiles/files/99111767942.pdf In PDF document text
    • http://atdawnwelift.com/userfiles/file/41804569495.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/29390661263.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/67476112815.pdfIn PDF document text
    • https://buyafranchise.org/files/files/77833558168.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/23049416554.pdfIn PDF document text
    • https://diphong.com/uploads/xeboxogimavitisuvasejo.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/22202942561.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/tovotesokumajabazoginusem.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/pejifonuwenij.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kvmk06u1o0jopaj0f9o0e5fj27/pubamabeluzedaxirijubi.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/10995698521.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/tabokudewe.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/90305997556.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/mixunin.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/febal.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/06/file/82538638098.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/xuravibas.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/wopenitimu.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/7d3d23k8fclpk5lrt240ovi07k/3664401911.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210901070501.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161362017be4ee---kowuwaxe.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/mogevopinef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=zee+tv+tamil+program+listPDF 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_off0000c991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 18408 bytes
SHA-256: 6e5f9376b9f3902d9c8fbe334575393cca4b15a61033d406ee19403e09ce115b
font_01_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 10520 bytes
SHA-256: 06ef5c7e75e3840434e96b5377500f59376d1868d29aff0109adec6828145d9e

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