Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d37b5eca9f7c763…

MALICIOUS

PDF

93.2 KB Created: 2021-08-10 12:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8e7bd93cb0a41df88fb6561d70032bbe SHA-1: b89594e6a09fec9c128eb24b5e0c3e4da98b743c SHA-256: 8d37b5eca9f7c7631a07690cff79150fa54af2db4aafd5fcf1635f3b8278cb16
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 appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is unreadable, but the heuristics point to a link farm designed to redirect users, potentially to exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tourpon.kr/FileData/ckfinder/files/20210619_356490881EE2FD27.pdf In PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/78660720899.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2c7df163512990e6171818032ffa31e/deforonamemiposewepes.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/nijiwuxet.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/kikugidotebetikusukores.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c84f08c3b91---18656273430.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/meritolitepuv.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/duxebepigujigufazifuliwiz.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/7397589851.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf22898ce---xazikopa.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd6a64e145---fuvokinapap.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/bgrn17hage29924lonmrev841o/jokodizulu.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dkgu1dlhql0v8nukm021rbq1l3/96166155431.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/273bd8552ecaca0e2bb2ee8f6a9748b9/muras.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/6b72837ea1ed3c2622f643eea6afda4e/342190197.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cbb8dcb76---retok.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/42696515269.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/fovenotenapevekun.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/24732322954.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/tatikodujovigobed.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/tokugededovorotasa.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/26799650419.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/18099805708.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/77655460529.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/53886495253.pdfIn PDF document text
    • http://mav-auto.ru/images/file/xubetevokaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gunship+battle+helicopter+3d+mod+apk+unlimited+gold+coins+2.6.51PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 12044 bytes
SHA-256: 5e25aa19826022723ae08e20faf7dca56fcfd25526e21202a707e12df9ca17ec
font_03_sfnt_off000139f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F0 16620 bytes
SHA-256: c9835b8cd23866352330797a39fcd25449760f10a22fb7da1876303a0b4d1063

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