Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6576f423e836dd6…

MALICIOUS

PDF

86.8 KB Created: 2021-07-23 03:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c8bd4c0a64291f7cfd995e40b8cd678 SHA-1: 9d4658fdc1678f53b01b22bf03a241d66838199c SHA-256: f6576f423e836dd603338b02f060656af1587a950d3040afe2bba4f7e171a94d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The file's structure and numerous external links suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ed394faa5b2b94b8d7a32fcd39f646c2/mokafevikowudojuruw.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/rerenobuvurinafirixepex.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/29686111415.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/133798aab92c800f3eb57406c2e3dc93/97480306546.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/97248096677.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/lavabafu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086a81ba90b0---zivoxomek.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/2035777628.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcebaf12501---4140307572.pdfIn PDF document text
    • http://berbun.com/user_img/file/finasorilekisazafe.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210526081754964.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/rotexawusamarakib.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d47442b8ee---jigefenatenipadofi.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/64995554629.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/5309222871.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082c912c3608---vuxezafaxorof.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/rawiluzow.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/29483450864.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/64180117368.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/62565608530.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3fd32a4c48d86613fa2790ca7b42da61/87700121461.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/lrheqsg3j5b64je6c2cu93l889/63663437465.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/futupelesobawilirudikevi.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/47307144936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=a+boogie+wit+da+hoodie+me+and+my+guitar+lyricsPDF link annotation
    • 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_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 16344 bytes
SHA-256: 50c1dfd4d15486d9e5e609feea648f891c8a783e2654fbbf15020dd740924c22
font_01_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320D 11236 bytes
SHA-256: c74f05e36eb09c3b4e25a2d0f38f002f4937d19c3d66e7100b49a085bc3e87e2