Malicious PDF — malware analysis report

Static analysis result for SHA-256 220b2f33416ee5c0…

MALICIOUS

PDF

112.5 KB Created: 2021-08-23 13:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2fdd9ff845779987d2df1087f8393d31 SHA-1: 50e542d0f1f4ec4b4517336a2553103d76579c37 SHA-256: 220b2f33416ee5c0a74d2e59becb562255152d0cda5d94254a553271dbeac03d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, suggests a link farm designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=jag+automatic+for+the+people PDF link annotation
    • http://rauvuonsach.net/images/uploads/files/73747429223.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/vuvelewugo.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/juperotikosarapokajavobum.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/07913de19f20e7e73a51b6c1ef6603cb/18927115015.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/viit16hq13ggrim0ugi9nigal3/38842710444.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/jujol.pdfIn PDF document text
    • http://hasyo.net/files/file/73467265752.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160817ba91b429---kigedu.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/fezewusazadepowor.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/tuvuluwanav.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/726a5ca3a82f95bb476e509f3b5c63ab/45900473947.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/vemonolewotenut.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/51d7296ca9b7384e2f1a5df4823a2634/74358509751.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/gaguxif.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/83180388094.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/1283628221.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/jupuvimijivufokuxane.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad28ac7df5---nilofobusumuve.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/60697913141.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3dfbc2d68---96882185336.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8b5fd26a6---lebojukodoxe.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160895a05a4f4d---41699688603.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a0d2694b9---53830485410.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15388 18156 bytes
SHA-256: 7038466c2fa6216fef076b2d1dec743af505d4658fab825143c731ea43969fd4
font_01_sfnt_off0001834c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1834C 10744 bytes
SHA-256: 684d206fee9e744ca410b77ed3a1afff69062eded1b2c141d1ad245220e3f13e
font_02_sfnt_off00019c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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