Malicious PDF — malware analysis report

Static analysis result for SHA-256 f397ec529b8c8a77…

MALICIOUS

PDF

90.4 KB Created: 2021-07-02 01:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b8945fb4f67f56c7f5124b06e3cd99f SHA-1: ab1ef667188eee617b86ce09469370d1abb86afe SHA-256: f397ec529b8c8a77aba0d72c0386ab8d0439376a770a80c15d5f4fbac31f93d4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. The sample's structure as a link farm suggests it's designed to lead users to malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/79dceb92c65f4f0fec6d45f8202e34c2/29116458404.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/zusupoziximileda.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e20726158---kapavaremowojupefanino.pdf
    • http://www.520amis.com/upload/files/xababinuvo.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd3e25715---rimatutokomozuvol.pdf
    • https://askisan.com/upload/ckfinder/files/52886541505.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a9a5e1899279b847eb40168cda0342aa/46822746847.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/f79938c21e32b65dcc041dc87612ebfe/49420831985.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/33dac63a2afe02e970ffbc99e968f337/wutekewotidiwizitita.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609037028dd74---49639029111.pdf
    • http://sklepjola.pl/userfiles/file/xugegudavokapiviri.pdf
    • http://ferrocom-spb.ru/userfiles/files/23878292348.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/cadde45217cf91b0a05c23dc8958d28b/sobil.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/t9thu5jjl3h3dr7ih6pgj9ifa9/nogarozumomoxapiva.pdf
    • http://alarmy-kamery24.pl/userfiles/file/82846131669.pdf
    • http://ttc-investco.com/img/files/54739629215.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/47a66b3c7b6126c210520eca75d997e0/xorurilisugatilamevuk.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1oishc12un59kh1o5ipc56cqo6/54309779230.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8fd5025df2e9af74f3024ea4050f08a3/56758405458.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba811798eff---peginilez.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/s4gfbq1r3fsn9r6n29p1fclj40/luxezibewibog.pdf
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/88943678435.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/afd6706249d6f483321ff1ecde53a4ff/22865840867.pdf
    • https://medtek.vn/storage/file/dovobebolomixevesuvusewe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sample+test+case+document+for+manual+testing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 16792 bytes
font_01_sfnt_off000116a0.bin
ec7287321922d35e2e32293c41707832d8aa3051e4966a76a4f60f7634c335f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 11136 bytes
font_02_sfnt_off0001305b.bin
05e520298017e80e79656254ae5d717445b01313773b7085c3776843c9fc13fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305B 16852 bytes