Malicious PDF — malware analysis report

Static analysis result for SHA-256 522d0be808d9c9b2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 22:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d7baaf7b917a6b021804115d1d9195e SHA-1: 401478a33585f5ff66a740f765ff4d57659391b2 SHA-256: 522d0be808d9c9b22698f0ac8e32b9a4a37ba0038aee0a304ea0826eae48a2b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggest the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://fruitssupplier.com/app/webroot/img/files/11804541229.pdf In PDF document text
    • http://mobil-tech.com/files/31293893718.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/xupojelenifagonafu.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/zedoji.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/lagexiba.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/63542133527.pdfIn PDF document text
    • http://samtekelektrik.com/files/45347590280.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/sudolewufifu.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/418474671.pdfIn PDF document text
    • http://handgun.ee/media/file/70347212370.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401cc269fef---27500645468.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/384ea0aa83cc33633b6861fd94e525be/milepixizap.pdfIn PDF document text
    • http://tradotel-riviera.com/file/setizofijokof.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/rabafinesikomirebogulup.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/vitajipun.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/titusi.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/nexug.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/90956422111.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2d108cfab---ruwipudifade.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bb7c3175---binokurodogo.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/27578457706.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614137fab94ea---42979295623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+download+apks+on+chromebookPDF 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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 11152 bytes
SHA-256: 7bcdcb403249cf298e98eda20c489e53ab50c26694edfd3f563f24541449a25e
font_02_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 18680 bytes
SHA-256: 4c460b99a1692f242a51e3a497e11ee33087a9456c1ba402c55c15ff03979ba9

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