Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c187d5e509879a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 00:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9916e0802ab62a308c1fcf5e2757480c SHA-1: 30b735d47e184371f803be433cb1de3d460ddf6e SHA-256: b6c187d5e509879a11d9effa6993c89bff1277ed7f5f906de2b6aa31d7fad256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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 https://aquaprosmart.com/userfiles/files/buzin.pdf In PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/86282557331.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/10694858699.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/89264274876.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210908_C08CD198C1248C53.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/roxofevabofakir.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/pelaw.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e87f360d07---redejik.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161314ed287555---17206411309.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/tirunegir.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/pevisaz.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/65039204230.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/86185640418.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ratajapoketakefubekuluram.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/16056128251.pdfIn PDF document text
    • http://dentherapia.hu/files/file/zakivekogapanoguwadiden.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915c68d092---poxikowejunax.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/kifujolopub.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/karijumesaguzilolajekura.pdfIn PDF document text
    • http://fnathservices.com/upload/file/57523515959.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/72495038984.pdfIn PDF document text
    • http://budropol.de/Upload/file/lusivinobenotonad.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/duliweduzifozibilujipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=magisk+pokemon+go+2020PDF 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_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 10676 bytes
SHA-256: 7738473a9c74dfa92f6b9836ec9b7231d9974763f72b4d60aadc9fce4ba81667
font_01_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 20284 bytes
SHA-256: f361d8d63ea94efdf4807bae6cff22e14b97763bc33d1f16b44f9302d725e762