Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aebd1d3a20e828d…

MALICIOUS

PDF

88.3 KB Created: 2021-08-08 15:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9d022fbb9b1ad3961ca5ea613596130 SHA-1: 8c27780f2c16c3eab9d9a6c531996f8ddc256691 SHA-256: 5aebd1d3a20e828d01cd5b70c6a9df760bcd08e37f7c27af8b585adc166c8638
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://whatshoulditcostme.com/userfiles/file/rasibovejaboforelowakaxak.pdf
    • http://bitite.lv/media/txt/122/file/8711362600.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a41b9e4edaf2ff785a9b468701f3df3f/zijegiju.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607001a80b782---34746172815.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/df64e2ab5a09de1871e7d5a80fef69fd/70002857889.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dea3ec65dd1---noxudomemikule.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef3900826---8810212203.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7dfb274786932bc7d5a51664e5627f48/jafenotazimebexovapini.pdf
    • http://kleinschaden.expert/userfiles/file/vizafibibidolobokam.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e605be552---78418138831.pdf
    • https://ebooksweb.net/files/file/27017507896.pdf
    • http://uticachemical.com/files/upload/files/vumavobesafabogikuwofiz.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161094ba81abb6---terizekesixikopolifovix.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/6pg1hudgan33t8uo351plbn68f/xigelevadopug.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5101f774e54dc32b05546c1c711a2f41/vedodunugizefesubozugopa.pdf
    • https://braindevelopmentmaps.org/userfiles/files/92030440350.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16244151968265.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/1ba2c514f844565d59baac00960cb618/6078840342.pdf
    • http://saikunghouse.hk/userfiles/55972911405.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc9c25c834---67315184802.pdf
    • http://daydreamspin.com/userfiles/file/sadal.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/72c71c7fa6229d1a3f0231e8f420e261/dijobamikugadetog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=k%C4%B1ymetli+evrak+hukuku+test+sorular%C4%B1+ve+cevaplar%C4%B1+a%C3%B6f
    • 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_off0000effb.bin
57f15280e53411ec2b6f1a6d625c26a8191e3702883e8588c976112c96699b07
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 18624 bytes
font_01_sfnt_off00011d6a.bin
1bcec26157fe93214a6fc32b695eb873d651b420753f52f303086fd61f0700d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 11264 bytes
font_02_sfnt_off00013775.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13775 16792 bytes