Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e218fc0da56b078…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 15:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26fe539dbba86a09af065392fbc64ba1 SHA-1: c6b8f418a980afda89b00d39080fc9de3f067859 SHA-256: 1e218fc0da56b07897bf3ce0606023cc5704abedfc8bddc98e89746a2d4bb78b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, pointing to numerous external URLs hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings suggests a coordinated effort to host malicious content on various sites.

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://smidgel.ru/uplcv?utm_term=how+to+run+apks+on+pc PDF link annotation
    • http://cherryontop.pl/upload/fotki/file/nerupejefesobukukexonopa.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/paralokugafipele.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/11131918779.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/3162615696.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/75215217657.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc19b16acd---50986845315.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/somuwo.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd40fb2dc3---18055907979.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/putijizaneravum.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/ragujaxavunegosimedugujo.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/12253438487.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0af8b2a91---romatopekununaxopid.pdfIn PDF document text
    • http://juentai.com/userfiles/files/pawajirorodajibizukafef.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/26666642357.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/wabexipumekofilaxakexu.pdfIn PDF document text
    • https://orrizon.ru/images/file/6026656112.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/dunesolibo.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210919200026815.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/84036473264.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/73733763076.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/32513942959.pdfIn PDF document text
    • http://proart.by/media/file/refivuranedij.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/runukewubofovamizurode.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/77241985104.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_off0000b05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05D 16156 bytes
SHA-256: c8357bdbe50b3779b3bb792ec5cd40707e02b19cb44f07c32f3f403dd3cf2715
font_01_sfnt_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 10368 bytes
SHA-256: cdef3c53bf0ad61be595b069885ee0647b28510b1e3d3f4e863641c503d564de
font_02_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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