Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c742742bc000e8…

MALICIOUS

PDF

77.4 KB Created: 2021-09-24 00:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d76c52a0278191dabb274a15ea62388 SHA-1: 081a44cdf51b1c4b174a5782aec79f537d5d5b59 SHA-256: e8c742742bc000e84b2d909975e73e209fbcc41fe5c87aa311095f2477ef6d86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish users. The embedded JavaScript is likely responsible for initiating the download or redirect process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pc580.cn/upload_fck/file/2021-9-18/20210918130607980386.pdf In PDF document text
    • http://hcbarrett.com/user_area/file/70500891706.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/80717531349.pdfIn PDF document text
    • http://quinta.cl/upload/files/61672880442.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/25040464808.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161380f28dcffc---371344489.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/71576727704.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/85042280418.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/8262161289.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/20860009377.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/67650980049.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/sozamifagova.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb024ee77---kotom.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/bobelanafeselagora.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/f1vqn1d1hcq27h965pjv440qn5/5506293100.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/budajewetodawo.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/65326582217.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/dinonolot.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1148e0d1---1102868495.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/zitidutukulapevin.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/72179592141.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/86380569776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=touch+lock+lite+apk+downloadPDF 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_off0000c869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 10584 bytes
SHA-256: 8926aab12cd5e26cc4ff37f473e67258d7d8fe8da353fca28ce24c64f9b34c4d
font_01_sfnt_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 18352 bytes
SHA-256: ea2e5ac2a28a5c8910fd8ec8b80807e6d21ed9cceeac5f438812bbcb59d8d719
font_02_sfnt_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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