Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1197a4a1befae56…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 06:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce0c9dc1d87a06c734a5a874f4e7baa9 SHA-1: 5ba02e118cc9b1cca741534888b5429f85f6bfbd SHA-256: c1197a4a1befae560fdb243bedac6abbaad340d6560b50d133adda8e7fd7f21f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript stream likely facilitates the redirection to these external URLs, which are designed to lure users into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=android+web+app+wrapper PDF link annotation
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/8621543523.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e0e1c9024---rudilefadibu.pdfIn PDF document text
    • https://limadelimon.com/images/file/13689722607.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/xatubumumoraniputagukab.pdfIn PDF document text
    • http://jump360.co/upload/files/20210915184605.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210915_165236.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c05868fd8---tajenogowizegif.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/zivivaxedid.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/31386670587.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132e932cb769---sobetegetikuju.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/wugomatibumito.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/82012079157.pdfIn PDF document text
    • http://erimti.com/userfiles/file/zemubutodusotofupos.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ce3bbbdc---96444400562.pdfIn PDF document text
    • https://renetravel.ro/images/files/jubagizejevakugiwumexoxe.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/wazotorule.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/moparemigatumaditi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132d6d67cb75---97197055608.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132523dba1fd---9936452410.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/43358554992.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/gusaxuwex.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/rijamadikatikivilim.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/vetuduvejag.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_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 18056 bytes
SHA-256: c603943fd2948abda7d5218972c4d0c1ea9f435644be6e5b1144cfc407ac5db9
font_02_sfnt_off00013028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13028 10280 bytes
SHA-256: b10566ca20fc3edbd9a57089c539523b201869d7af2f743e269c8fcb1833b40f

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