Malicious PDF — malware analysis report

Static analysis result for SHA-256 daea9a26efa3e54d…

MALICIOUS

PDF

85.0 KB Created: 2021-07-02 11:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba8b1569d7f752f3aebd7fafb33eddad SHA-1: c6f312a4f2a902d38ce77425955f21adad38e9bb SHA-256: daea9a26efa3e54d663e295f471dc33454565f31f92bf13d585aece67b9e3b98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for credential harvesting or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://maraulsan.com/ckfinder/userfiles/files/laniruxil.pdf
    • https://abugfreemind.com/userfiles/file/piridodesixefobedavezabu.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rdh27q9gjt9q4m0b86n8jflc40/tulebaditolulawisulakaved.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-28/20210428212640749764.pdf
    • http://wagnerpc.com/userfiles/files/lobumefibimosezazixulixu.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09be270c2---79921534231.pdf
    • http://mobydick-band.de/fckdata/file/57749771601.pdf
    • http://bafiti.com/sklep/userfiles/file/jexekipatawagu.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c114de041b9---kilozexip.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607334fdc3fed---lumopifazidibomel.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5f88fc69eb82b1f60677d9d6be6dd060/84430658046.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/56953d64f03d10789f50d4fda601d116/79078563038.pdf
    • http://www.bash.cl/media/file/jefomowofol.pdf
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/tefedawidesezepup.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/wezuwigaxenebibixepelawuz.pdf
    • https://personnelcle.com/userfiles/file/3493102085.pdf
    • http://short-story.ru/upload/file/80167889360.pdf
    • http://krzysztofmalec.pl/gfx/fck/file/joxawepemetowakafu.pdf
    • http://ray-king67reunion.com/clients/41562/File/mejefumufafugijesazejo.pdf
    • https://avela.md/userfiles/file/migojalu.pdf
    • http://allasclub.com/campannas/file/56331851469.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/vadutanaju.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6ea4e8b6---3360665778.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a8800df9---44221902067.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=praise+and+worship+songs+and+lyrics
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e813.bin
09c174b93707e040f433b4b92e1e3ef77b890f958419a48212ef84f66f1adb56
pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 10896 bytes
font_01_sfnt_off00010106.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 16792 bytes
font_02_sfnt_off00011918.bin
08da918fa4e932df7f54417654766a187dc1cc5da6e7968fdb01e64e4a9e4eaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11918 17252 bytes