Malicious PDF — malware analysis report

Static analysis result for SHA-256 072c1cd7936c7126…

MALICIOUS

PDF

86.5 KB Created: 2021-07-05 05:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 517561908b87c1830b79d7f8cfdb9d08 SHA-1: 275cf8a7e7f75f1806eed5ecd78cae84d51e6a2f SHA-256: 072c1cd7936c7126f1357d8f4af03395031db2ac731a242caf1e88541f714b1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggest a link farm designed to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://appchecar.com/ckfinder/userfiles/files/jemolavuta.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f0b0134420---96811987840.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60548c089---61531569371.pdfIn PDF document text
    • https://mattress-leader.com/media/95860992021.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad40b8adc1---zinena.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/44592518009.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/wegukiporozexizorel.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/17328683826.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fa1dfd8123ead305940230ceb58c61f5/35267910274.pdfIn PDF document text
    • https://avenue102.com/uploads/file/bunamalekatujugulap.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/02101a3b0b009f5c3f96749ed0a68e50/80365955805.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/xuvepemigumugali.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/3c940ff48f0a865e2ced0922925e3111/sinojajagojisadegiga.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/30879585524.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7f6820e2---zepuzadupozi.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/54ed30769f9299255c05b099182fb30a/25201155219.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/90500897661.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/mejoguwadamiwo.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/wolidokosopoxefu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc6f0b5c16---tobinegutadeluluzenomure.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d344ec5b64---tagadake.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/pekunufazaxutapuvapi.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095577ca251d---vadowesupebuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+you+say+hi+my+name+is+in+italianPDF 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_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 17900 bytes
SHA-256: 2bfa3f33be511620a29c40995fe03b17991f0b1103d69a4e74829682b72827fa
font_01_sfnt_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 10704 bytes
SHA-256: 204998d2588f8dd7fb2890ed0af7850231177bda63b05dac6af7028e5c39cea0
font_02_sfnt_off000134a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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