Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af1da0b8ee6103f…

MALICIOUS

PDF

89.5 KB Created: 2021-07-13 20:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 85c7f4fc23e30807c770156cc11d3782 SHA-1: 28a477f0fc541a6f1fba37e0e970c5122e1edf71 SHA-256: 1af1da0b8ee6103f00755aa8f723b1e4ceb8a91d6807c0142e7453462de95b01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=what+is+the+central+idea+in+this+passage PDF link annotation
    • https://photojet.bg/userfiles/file/43060186100.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074912a582d1---kigewex.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/nunekowoniwikabujomi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce827b5de---58503591576.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/65382567792.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/98090059181.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/gumovojawujitejux.pdfIn PDF document text
    • https://isosklo.cz./uploads/57790635388.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/domiwirax.pdfIn PDF document text
    • https://alutat.com/data/file/91216344233.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c3780bae640d5b4961b3a866decfd917/wewagebawodedunosik.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073ae1107717---zubowejexozefaka.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/wobofijotabepi.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/jibotuxunugesukagad.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/6683444291.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/deweba.pdfIn PDF document text
    • http://geoman.cz/data/file/wixumuvotonozufifor.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d272f5eab62---muvuxonit.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/95381917257.pdfIn PDF document text
    • https://doitoutdoorz.com/file/CCITG4Coq0MDuVUn.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854e5fd5f04---wakireximemo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ghc8isb20dkunmptep64gqehd2/79214113463.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/591a8494ba10a292b2ca093cdb4112bf/77853392334.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/cdd4jif7v0mu55fl4lrn3c86s5/ladazine.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/694512796bbbd42b6ce29907b273c749/26518380103.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_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 16780 bytes
SHA-256: 562bf1b5f0c3e90ab4b4233bc6bb779c6cdbbcb2b7e87b10305c55bed5684715
font_01_sfnt_off0001286e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 10668 bytes
SHA-256: 66952225d9ca75d5329f8aa0d618f87bc9e0ed3bb4184c729124a15faf26c9e6
font_02_sfnt_off0001409d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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