Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d9a3386a777a17…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 11:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b00c7ee946b66bf36f4c01249ed992a2 SHA-1: b15bbea2094fdd9c369754362a0dbff23a78b129 SHA-256: b6d9a3386a777a17b82949506bdc7d14f74713c5e8ae21ca0d433b4bd15c9a6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=after+we+collided+megashare
    • https://matrixx.lu/images/27409060296.pdf
    • http://lamgi.pl/ckfinder/userfiles/files/zewopelefafefuja.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f572de912c---36630261496.pdf
    • http://www.ondebiz.com/userfiles/file/kafafujegarutebi.pdf
    • https://milorem-service.ru/userfiles/file/jixukurogotesoxigujo.pdf
    • http://aurastaffing.es/upload/file/dosunofobaj.pdf
    • http://goldendazzle.com/upload/quangtri/files/gogatomilufajopa.pdf
    • http://sumisaedu.com/FileData/ckfinder/files/20210905_4A7C054C888C9414.pdf
    • http://chromavials.com/d/files/bonej.pdf
    • http://saltokisport.com/uploads/files/bodusiwiwe.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/bupar.pdf
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nunepuzipef.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ufq9qjii96d7k3nb6orbpj9912/70646094032.pdf
    • http://aptekarynek.pl/zdjecia/fck/file/33478298913.pdf
    • http://jmk.kr/ckfinder/userfiles/files/jagakipepelusiva.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c290c5a3e---4227658991.pdf
    • http://chemtron-vostok.ru/media/file/69011759424.pdf
    • http://lidaoxc.com/upload/files/vibakezubakazigen.pdf
    • https://autosaloncenter.com/uploads/file/zonokukagorubofiwus.pdf
    • http://imailbox.nl/images/uploadedimages/file/xebolewili.pdf
    • http://abpjseah.news-read.com/upload/files/tixuxez.pdf
    • http://cuanhuadanang.vn/uploads/image/files/wumorudibixi.pdf
    • http://ourconn.com/userfiles/file/202109111130573160.pdf
    • http://nwatchonline.net/userfiles/file/tezexetala.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e28b.bin
bceae7708ed5d78d4368b1f923f8f0922c682337211dc4c16a58384f87531844		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 19172 bytes
font_01_sfnt_off00011551.bin
7d3f1ff231ca8930f6dd6266715a84dfe03bbc684ae641d15be5b0f26b87679e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11551 10888 bytes
font_02_sfnt_off00012e62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E62 16792 bytes

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