Malicious PDF — malware analysis report

Static analysis result for SHA-256 68270975a821f4bb…

MALICIOUS

PDF

79.8 KB Created: 2021-10-07 09:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dbad7c79d31c169401e09b8df0ab50b0 SHA-1: 751004911c13a8cb9090d69ad476343a600e745a SHA-256: 68270975a821f4bb4f2d991d737d468b94fbc9009d93d43964d4a319d3abb961
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The embedded URLs and link farm structure suggest the primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=how+are+sediments+created+and+how+do+those+sediments+make+new+landforms PDF link annotation
    • http://refmexgl.com/web/uploads/assets/userfiles/file/44793002848.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tmfukje9vospael6saq4jnlq22/zaxukedupixigozixikurab.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/mesukijapevupomaxo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16152bc3e72564---jogifuxatewej.pdfIn PDF document text
    • https://12shio1.com/contents/files/vubewe.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/veximojim.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/3549660715.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/98213348356.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/366259228.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/5952981898.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/46216226569.pdfIn PDF document text
    • http://vkts.se/userfiles/file/16319782804.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/789899284.pdfIn PDF document text
    • http://epicridesnepal.com/files/rawufisomojulefupogejudax.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/tebemak.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb3824537---tetezaratunopurekonaguv.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/rotoxivojalumoxosurewa.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/gozajitodojusuditumota.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/672334602613b96301d801.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/tewuxujudalisupubo.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/74898235674.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/tironirugezeriji.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/lajofovuzijokodewexokulez.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/99239577041.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_off0000d0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A4 18136 bytes
SHA-256: 0a94c0fcb307e3c97a50f11e99c42e0c6a7326e57ed2ba2603f785bf5d1ce5de
font_01_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 10908 bytes
SHA-256: 37d24d46353903a107664b98266bd083e2be73c037e9c5c20dec69a58d8104ec
font_02_sfnt_off000118f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1