Malicious PDF — malware analysis report

Static analysis result for SHA-256 8469d181894a11ed…

MALICIOUS

PDF

86.2 KB Created: 2021-07-20 04:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a7c6183860b1ff13e43fd46e1ae25dd SHA-1: 165d962bf15d72f0757a0999ce52d9f066a241e0 SHA-256: 8469d181894a11edd8b56710222019eac8f06fab7f2e3120de3351e6c284a93f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to a phishing site hosted on compromised infrastructure. The numerous unknown URLs further support the phishing and link-farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/lapipalukipogu.pdf In PDF document text
    • http://garage-fuji.jp/js/upload/files/tuvibodirubabijumu.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/jonago.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/73d4ad3a7e9a94f268e7861c94a8a228/datubonugebirukuko.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c9d0a7f328440a55a099863aeb2d7d01/zagumufumosuwe.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/51810447497.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f17275f5c70ab416e79663ff0fe35c12/5480465425.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/mivupaz.pdfIn PDF document text
    • http://premium-t.info/files/files/fepezipisubip.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/qucjph0fdr8cf9mjhq0n28fotv/jutotumiguxofigidudowa.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/mh12rsshmhhs42ssnhlnme3kc9/86265611319.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/6987162704.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6e3a29a16---pavogapetige.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160f5696fcb474---tetuvojoxe.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16223068793934.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gmekb9ltdjo57epnifr892223j/tigawagiwapilovafimuz.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/56142904970.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/53340243726.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/gibekidobilisajikori.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/kozuzodo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9270d04b2e---35937942002.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/54336535405.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/57299582b581636312abc4ad1fd4b373/5664407676.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/cd5703edf8a43c1c82c1524322076bbb/11151319082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=quickly+reading+a+text+to+get+the+summary+of+itPDF 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_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 11392 bytes
SHA-256: d4e34e2f9b1989e3e2214943993a14e82df2a2d3e7646adf4b8dc5e2f760804b
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 17140 bytes
SHA-256: 49055a180bcd6bfea044552aff34a1b2aa848444eb753e2c05043cca6cfcc93f