Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba234ea719934095…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 13:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4f0b4d61d91069e1ba50aad8af60ae87 SHA-1: 14fd9629d7c2b9023f05cc1cea39b20e42ac5af3 SHA-256: ba234ea719934095e65d25bbcc23eae6ef0ad7d916e58e9e4ca0562229fea95d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://drafthe.ru/uplcv?utm_term=robbery+bob+friv PDF link annotation
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/gexibetezusalevexubapa.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/396c12e7997fc52f4702890e2db4e180/gasaso.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109010719498227.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/81244876862.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/94641220721.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465c603bead---53373000738.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bdcca3cc2---11632731639.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/derevudizagabinap.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/texawitorufuvedamoj.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/399277224613a656922ff9.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/87384079536.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xasanikexuxaripivukugumom.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/50843140183.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/r2i7jleol79dqi5qimgb50a2l2/dazozax.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/96674453856.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9e27670998a3a76c8c1c46da865574d9/97025352026.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/sexoxabovukuderam.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/2230170456.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57df5fea9d95a21aa5fd4edd9f18c982/ziboxavolalozako.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/samolavewabidedunifine.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/178e0e80fa8a3be7c6b6f0ad9d11f591/zusovowusorazem.pdfIn PDF document text
    • 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_off0000b003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB003 15408 bytes
SHA-256: ffbe0e3664eafb3d975a21d5be8d8560f7ce50320395672a3ae4f75599bac183
font_01_sfnt_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 9992 bytes
SHA-256: 126fe297d2fa613e03062d00228831bebf1904b62f4d6b6994ef2bbf23f1c65d