Malicious PDF — malware analysis report

Static analysis result for SHA-256 c078b2ce005d3ab1…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 09:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3fbe83c031f97f8da6b7edd2268de76 SHA-1: be4bbed9d19930ac8ef58622e1d302e85d4ac612 SHA-256: c078b2ce005d3ab113bbbbdce1441dd68e422e508b34e017f9cc047b99477ea8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or SEO poisoning attack. The primary goal appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=topographic+map+lab+pdf PDF link annotation
    • https://mamadona.ru/ckfinder/userfiles/files/lerajafukutalibemuwawop.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/28174853587.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/jikivilo.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/fupatun.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/ranigap.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/nunosutaguvagemebabipan.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608708aa3ba2f---58484467779.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/sixerebovotolokaputonavof.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/qv6l3e9ebd56rim8vtlftb0u0f/xupamerupowirujuvasulu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096103bceddf---20730934124.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5d09df2f---kubotegurozexixi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6610c2005---nivivanewagamo.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rp3t1earftttc1564dqtjebkfj/82428943984.pdfIn PDF document text
    • http://jaatkinson.com/userimages/94175503401.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf076273de---60294093346.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/jasemifajuwiwe.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b364a05024c---59458249117.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/65406704098.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/3531479089.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/81628289581.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/99364539042.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be3af720a20---venipogapus.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa2af1a383---balapapiwonuminabodes.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_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 10668 bytes
SHA-256: 58f511ea8f4675f49f73eec083fb34a0fffa0ad4c827cd4a96aec4a1480fcd52
font_02_sfnt_off00011f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 18420 bytes
SHA-256: 8667ced414b7e3feca85c70275c396ea50f440101bfaa21d01a8722475b4b611

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