Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb04f82a2d2404e7…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 22:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b964b046e74f8d531d5ecb01fea39ab SHA-1: d38edc2ac5d5a9949b68601af1e3978138526fac SHA-256: fb04f82a2d2404e780e5e7758b116ebbaa6bb2c783910e7cbb133d863185dde4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://fusheng-vietnam.vn/admin/webroot/upload/image/files/61646869054.pdf In PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/tojesinumokozipuzisu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5938adea6---32224557040.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/wubovizalir.pdfIn PDF document text
    • http://hueide.com/upload/files/roxigaduv.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/24704535667.pdfIn PDF document text
    • https://33mobility.net/uploads/files/babunelide.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ah3lv9bbvhtumflcsfabr8te70/kewepuwinegu.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/61219965796.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/losegesezozubijajebabal.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/negaperesaxebirifa.pdfIn PDF document text
    • http://ibb-online.ru/f/file/94226790016.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/72696646626.pdfIn PDF document text
    • http://turatabor.hu/media/nekifobegubiduxokufo.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/rakedu.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/73854536815.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109120712549253.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/12697985602.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/50271680207.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/9195151196.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/temeramulavekozerusetadu.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/wobew.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/furatanusatitexarup.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407a603b37e---dakelasiwakixufuru.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/69d42945d6dc3026ff3be5126081597f/tefurufivalonuruxakopekeb.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144e7f642535---davelelowuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=watch+online+mandalorian+season+2+episode+1PDF 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_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 10944 bytes
SHA-256: 675738d30b776d1e1944d88082574f0e0db86de78a2403f3b576243e82ee841d
font_01_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 18392 bytes
SHA-256: 5f035604592dab5ea30fe7ea4d80695bc0417dd037de0d1f2b122f046158b564

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