Malicious PDF — malware analysis report

Static analysis result for SHA-256 8533a9365a10dea1…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 05:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85b21694e9bfea8c242a2953cec11ed7 SHA-1: e0cb08162a88bd035b2f982bceef00f5aa38d064 SHA-256: 8533a9365a10dea1fed90429153e4bde57a2583c6e8f235cd558edc3e1334b4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links form a link farm, suggesting the primary purpose is to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=emulator+ps2+android+chomikuj PDF link annotation
    • http://cheniou.handysociality.com/upload/files/89469708000.pdfIn PDF document text
    • http://eternoohydro.com/d/files/votejajesolaradoredo.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/kogirifikarawi.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/49194720792.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/65087371347.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5d6ae02f8---61772708672.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/49jv06e2l0jihbh4jhgn5ensb0/97166071078.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210918101407.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdef26d614---joxajiju.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/40906295.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/3402533750.pdfIn PDF document text
    • https://redac.ch/upload/17546716724.pdfIn PDF document text
    • http://adice-area.com/pictures/files/mafejojupomuwotujesewat.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mhdmptaumegde89t52u0tjqsa7/padepanitidikudulibi.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/sapalig.pdfIn PDF document text
    • http://safarang.com/basefile/files/xivovowilamonegurofumija.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/79554805957.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/pawukibarezi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02f473c1c---vafadologa.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/razinegido.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d399f3584---31072530481.pdfIn PDF document text
    • http://mgrima.com/files/file/67745113327.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/liwesikosasabomumetek.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 22572 bytes
SHA-256: ba1b15c6bb3db9f5b6f0be3cf1f24526ec969199e67a0a9cd93764dc1a9c2e63
font_01_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 11072 bytes
SHA-256: 19cc6057836a94c8bce623d2685fa18ce62b0bed10d47b49e6be436dfe98d11e
font_02_sfnt_off000130b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B9 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_03_sfnt_off00013970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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