Malicious PDF — malware analysis report

Static analysis result for SHA-256 26386e74100a294e…

MALICIOUS

PDF

75.5 KB Created: 2021-07-07 18:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d3d6dbf5f3dc1652c5f2ca7f2e320c5 SHA-1: ee40fe0aae6dbbeb6573146668f5a4082ea9be0e SHA-256: 26386e74100a294e1e8d61ce56299f35bb2eaf82aaa4eb77e0373928baeb4a52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of link farms and compromised hosting points to a malicious distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2788ea9f9---furijumebowupali.pdf In PDF document text
    • https://galerie-louise.be/userfiles/files/xatesosumopi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083943f49145---3802261752.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/luposapokapibubemisukedo.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b5b0e1e5a---41509030387.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c717e802a45---52683933616.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097307910501---lorolomunuti.pdfIn PDF document text
    • https://airshow-bg.com/file/10781349071.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c927dc744---daredezasekiganixifaxala.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/23e30da6ef64ee9ed4d14af4ea277c09/labeselekilevudaxigimul.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/wamep.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512154514346919.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/23230313194.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/44059355247.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/87992260710.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091177796d5a---7547698376.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/fufizufifipavoxarenikad.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb0df5a476---vunosebatanusuxarazupude.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee11085cd6---zotelafikapujat.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/uv0tg2tpu3p74tvjlm9m0kcgo7/laxupunegexolemopefisokin.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0938e40abb---71987977303.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/mejuduxakotezalijuvoxawi.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/702c0f371dcbdc2f6060fa1709ce888f/bikituboxakobugugata.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd087f2b7---99651851226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=entice+meaning+in+bengaliPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/89755802361.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_off0000c32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 10308 bytes
SHA-256: 9ebc45f9f37ece392f6b96507c5874303d7283ce2fe7e594387d8ac852c078e4
font_02_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 17612 bytes
SHA-256: cf6028a57da183fc3a9aac71207b78d0417ba7239fc55e3a02ee94394c9f05a5

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