Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb46fc99bdc4397…

MALICIOUS

PDF

84.5 KB Created: 2021-08-16 03:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 179f5cf6bf018c33acfe51d7134fb992 SHA-1: bf0d80694dfbadc4c13449579ca685c352a2cf60 SHA-256: 6bb46fc99bdc4397a0c7387184b450cd69838e5ba23905e6cb68fefaef29fa9e
164 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 and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users into downloading malware or visiting phishing sites. The presence of a 'download button' heuristic further supports this phishing and malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ti7ejh5eirfqbc4edcoq9nud6g/78015120049.pdf In PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fcbfc12929fe2196f898246509a527e0/nudoni.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/87116764321.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/88054419672.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210601_024854.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/297a5c34931cc80b0e455a91f7a16109/mupikixapagapubagil.pdfIn PDF document text
    • http://nprofit.hk/userfiles/82580750200.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/pumonurajivadufiwus.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16111387264f60---34797958790.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160711b2839c31---bivemilirobil.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5c4e7d575bb91d67e6db48599a296099/mulekorawelevinomaf.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5737c418---jizem.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/45f3349df22ef453bef3ca4bb0864b2c/laderigit.pdfIn PDF document text
    • http://mcutech.net/files/jakokopovujodepasagire.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/kasavoxadijexope.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/22115942935.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/80617e8ae25da17d8d93732524a4b0dc/12628208067.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3d6b7e98---16984478964.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77be859b03---36049089899.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qmj90pb81j5o5g9ln0fe3o4611/33563630311.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/0b0f2f555537cf93e79e6de95073e574/76077281629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=kaththi+full+movie+download+single+partPDF 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_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 11188 bytes
SHA-256: b035abd82a043af71d00621015dd9a7a10ea1e164cd11c350ae7b2c04102a4bb
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 17020 bytes
SHA-256: d713ba1cd62682657906fa41858d89d117d64a5118e6f331fc6d06f783bb66bd

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