Malicious PDF — malware analysis report

Static analysis result for SHA-256 469ad18f2273b2d8…

MALICIOUS

PDF

69.9 KB Created: 2021-09-19 06:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 864272de0de2222694e7d596c1b06b2b SHA-1: 9a7fdae6ad346a5695e05c9128764d2b6a707c99 SHA-256: 469ad18f2273b2d88fbdc8a0bcc72d6973620d9a98029efa5407977e5fed11e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'link farm' heuristic and the ML classifier's high confidence score further support this assessment. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=gta+5+skip+human+verification+zip+file+download+for+android
    • http://sreema.org/FCKeditor/file/79048347516.pdf
    • https://dreptultau.hotnews.md/upload/userfiles/files/wituvekezawidigodagapi.pdf
    • http://montagnobozzone.it/userfiles/files/gosabejafotizuviwaf.pdf
    • http://iberia-ex.com/images/blog/file/87357207762.pdf
    • http://bonezi.morefriendship.com/upload/files/mesufefofe.pdf
    • http://tylincms.com/userfiles/files/binipomofanuresizuganakak.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a3718469---35624586967.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0903/67e00cd362a91c360a8f98762cf107f2.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e52027787---33664993185.pdf
    • https://camphacement.vn/upload/files/lobiwedideporupo.pdf
    • https://paeonia.ch/userfiles/files/84861412721.pdf
    • https://tidurmalam2.com/contents/files/76784623488.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/kivudixilulonipufijumagav.pdf
    • http://haciogullari.com/depo/sayfaresim/file/65115822663.pdf
    • http://abwva.com/uploads/files/mefobub.pdf
    • https://motecx.com/images/file/tojoxupokudilavukud.pdf
    • http://vizugy.hu/uploads/files/lovawesili.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/cjv355f9k0fb9cgjbqsanfjde3/nusodefa.pdf
    • http://hanasushimenifee.com/uploads/files/fiwasatavilukevowutotup.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/30466015394.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210913194222.pdf
    • https://xuantruongtech.com/images/ckeditor/files/36418604633.pdf
    • https://betenagro.com/sites/default/files/file/38915982829.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_off0000afc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC4 16792 bytes
font_01_sfnt_off0000c7db.bin
2efd7dd9392278a4826c0bcf411de6c3337adfa4431bb5c168ef484b6167aadf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 11464 bytes
font_02_sfnt_off0000e2ee.bin
d9bf88c55b7298115c683780101a2ca7ce90ea8743283aaa625fe4da1c02e69b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 15376 bytes

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