Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2489e4ca6a91e4…

MALICIOUS

PDF

74.0 KB Created: 2021-09-02 19:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5028265c17413014a3e6f59dbcd8b17 SHA-1: 9163fd955d28bf1ccb01ea5313bc7cbf7b7b54e2 SHA-256: 4d2489e4ca6a91e43b093a8dec55fea3c5abcaa1ff7b2397d7f509edb38fc167
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a30ae97ae1538f06a2facd611a6c6ee5/dosabotajimujukip.pdf In PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210830031509.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/81642325467.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ced51b7c1e---62966479168.pdfIn PDF document text
    • https://parkettworld.com/upload/files/tamawegenafapimixodedu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2f1d32d64---22491436686.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ed1d82842c1851e31d94d38b40e2933f/503629958.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/60494874719.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/zejubo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/98292025915.pdfIn PDF document text
    • http://specimport.by/files/files/kewibivegovusijibizasa.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/wejij.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/zupasoxutesabitekagezazad.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/56969190038.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/jutizuxokomuf.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/18f8cdf349ae70b1fe80ae369d1fd1cd/lanofod.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/gawut.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/85c614f660621f193e409d41c1829490/javem.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210715133507.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/62916367667.pdfIn PDF document text
    • https://recrut.com/files/files/gelilolipulup.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a41515343fa---kifipuvuli.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/filagedoxemiboguvakurutor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=connectives+worksheet+grade+4PDF 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_off0000bf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF19 10956 bytes
SHA-256: 7142259285da56520554289034fa13a5abd56afc42e02fdb042d48df2740f98c
font_01_sfnt_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 16296 bytes
SHA-256: ac710cb5949aa1add4242cb4ac0965e3a97f5bdc05db4ab74ae274984f9a0c6a
font_02_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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