Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d95dfee877bcb5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 11:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b5f14bcf9e327cd893a5d4bd17bd2c7 SHA-1: 83e12ee55da4e7194ba84f111be16d02c24e0bc0 SHA-256: 15d95dfee877bcb5613b0ff630d9cb43c1779f4128d448eea8634cda1c6255e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tythb.cn/uploadfile/files/67428726539.pdf In PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a597ceb9e---tosonixenepupuvegoxu.pdfIn PDF document text
    • http://zippy-inc.com/app/webroot/userfiles/files/mareloxaresujede.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/nobesemase.pdfIn PDF document text
    • http://azizolace.cz/images/file/75399960497.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070609320973499.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/28719179631.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083df06769ae---kedukujewuboxefovev.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/vofakakotetejewivege.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a156e73d4e90d4c9d6111ecf30f677ae/fefolibiselebekozuba.pdfIn PDF document text
    • http://tele-video.ru/upload/files/terejasililuzifotopunesa.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9177c631f5---bawonemisotupigov.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/91293082962.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/kowotusegamuterubodop.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/dhf90mqcf4p58cvqgt0i7ojt96/3269179638.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f8ae662593b12bdf531bcb512f540146/66480424979.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd5954578b---58354249764.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/zanojidadapox.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beed4bc451f---suduf.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/fajotosesetinukedaluf.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/lexuguti.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07e20765a---ninesebadono.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed32a2732---67054063577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mean+median+mode+word+problems+worksheetPDF 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_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 17368 bytes
SHA-256: e71eb3a71020fb3b7380f7455e24e853a017aa4754dce23ef24face8db975fb5
font_02_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 10968 bytes
SHA-256: ceffd009563a2fee7b068031dd64da07eb06cb8183c56ce42af92117d1f975dc

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