Malicious PDF — malware analysis report

Static analysis result for SHA-256 5843dd220138c8bc…

MALICIOUS

PDF

88.5 KB Created: 2021-07-07 08:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c383a98da3417bacdfabad4bc3e1bf38 SHA-1: 7fe3641739c6f1989e0888158268bf5f1cb64174 SHA-256: 5843dd220138c8bcf437847e56dbfdb9addffd531c0c1852b58b364e9cc0becc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sp3siemianowice.pl/userFiles/files/11265296608.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105051347194417.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/698cce87c9c84c21ca28dededfba85a1/41705209643.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/fipad.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c57b9518678---wajaloguwamawakigo.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/jasojakegivuwewivap.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/91881261331.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/1g88aauopbndkjc8bjhr6l1cd6/gotowepekegukapabemuje.pdf
    • http://abwcolley.com/uploads/files/11283428203.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/6be2vp2luuj9abt8uioebu0tol/86629551181.pdf
    • http://studioingegneramato.com/userfiles/files/57309029969.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/960c6408867324661a210d039e694554/tubuminuvabopopilatugom.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d1d9c9b3---12923700929.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/zutelafevibatorazogej.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/cafd556b818d2b45cade2a11cac04be0/bumuzonenasogafofow.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4b22a1be6---68003566555.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pedopilovoxe.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/31e396ceaa3b5f2615b98a42e7e95150/nafulivofusari.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b1a9a17f---zapasojowugokuw.pdf
    • https://pristineleather.com/userfiles/file/33971507542.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb0a844d6---17626905938.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/14c5490c3c53e3f7623f948af2307e40/71005800775.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/296ced2004ada59a48d2626053f1c264/buwosixubiguledolufep.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/4fuldgohhrhshh6rr0iuc03dlp/80882245534.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ea5bd68d---matufakif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=screen+mirroring+software+for+pc+to+tv+windows+7
    • 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_off0000f475.bin
2dfff76456e64a0f7357e6a1177f77397ba04cc0d8fe91aea76f877f1780c340
pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 16920 bytes
font_01_sfnt_off0001206e.bin
fa50a59370d5856bc79fac8db9ee48161be95c82da08392c7bcd6f213b43e0f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 11196 bytes
font_02_sfnt_off00013a84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A84 16792 bytes