Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f83394e9b34ad23…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 02:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0c39b9e6b1359c6b7e96b82c131082a1 SHA-1: e5049d4f78ae4ea206d52260b2f4cd542c14640b SHA-256: 1f83394e9b34ad23893e1992285fdb7ede5e3d11770c19dee95690a51ee09d71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=goldberg+genetic+algorithms PDF link annotation
    • https://idosekotthonaveresegyhaz.hu/files/files/36850694368.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/46658030959.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1f0e912f66c67ffe84f26a8c97bc39d7/94187711659.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/75529834628.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614022bf1b90b---vulibebi.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/begitiwatofari.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/89916420573.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/11822864130.pdfIn PDF document text
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/linolabipevozaxed.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/zajorewal.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143165ebdca2---19961525805.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/96077190109.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/35031705993.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/xaxavonosuranusakapok.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/40482753835.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/36269657193.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ff3361781---zuvuvabirip.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/bebapimo.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/totaxuxomukesel.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8a0a932eb---14193609318.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/31397650466.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/sumusetuga.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613549aad4e54---wozirikevut.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_off0000af97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF97 10996 bytes
SHA-256: 9adffb26b6fbebf34e91d3939fa1e405815bd595df1a0c6e69e4a75195476fc3
font_01_sfnt_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 15796 bytes
SHA-256: 008044a2b52109d19ad3862941ff106323ac608b31e5ea12bcd07dec2ac6048c

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