Malicious PDF — malware analysis report

Static analysis result for SHA-256 647d6b7f9f4a87a7…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 11:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 76d8771f3db3b97c1f6e654a9c92e933 SHA-1: 678663afac68e70c1badd3c542dc33b4a23d09df SHA-256: 647d6b7f9f4a87a7fba8a9c758fee057d20b061630b5b20d30c46a2917df328c
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting. The 'SE_CLICKFIX' heuristic suggests the document instructs the user to press Win+R or paste a command into a terminal, a common tactic to bypass macro restrictions and execute malicious commands, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://eiak.org/upload/editor/files/lirox.pdf In PDF document text
    • https://ahreco.com/uploads/news_file/11647263261.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e1b2382cd---51173356231.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a308b70c4d---28101387944.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a946ffe63ad---betanekej.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c4c902096---zenos.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/99jgpnmhrbmfrb7c5b2jrrqsp1/19708918836.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/d584d8a67872f16b0dea860b1728d6fd/13964597458.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210523054756.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/59021551377.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/zolino.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/tomevolivopuwuronobitagi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098397798c31---83422585212.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/77009378120.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f1e38b93d895e39ba62eaf4acdedcfe2/34014133036.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f280cf31a0b0be3c0f1a92ba4ede45b6/60809349030.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9a840853c2a508dbf694b55b724bcd1a/sizewe.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5db62db618ef0ca0a98c34503713a6f8/66844144404.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/i5ddg494hgsop9fo4unohgv49m/95848283913.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/18640253047.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a324ec7003d---35941443613.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280da86415---pumojuxavarijawubumo.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/6e3b5cbf0d6cf171842274913d40a492/degulogusolilubugi.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/towegakapokevulog.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/48717098544.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/03fdf857346b1ec832f376d212c4ae10/66186157062.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0d9d6d7382478bba844dd2713e314b10/sedewoxugubeporop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=unable+to+switch+off+airplane+mode+in+windows+10PDF 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_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 17124 bytes
SHA-256: c554317e5ede88af1e41056c2177ba254875ed23cd6b5f9282281b2ff2ace256
font_02_sfnt_off00013eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAE 11292 bytes
SHA-256: 7fe1ee5c719a7ae3aa4eda5f09fb18a55dde55c892d47ace593435d88eb1e1e3

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