Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a92dde2430b49a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 07:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b5160ac90476a85c98a418144e233fa SHA-1: 652b1d57e89d374515f3d141f00301e8cf9125e9 SHA-256: e4a92dde2430b49a56c1d5290d4de9e39e8579059ffe7ed01fc500cb6ada3f93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kxqcgs.net/filespath/files/20210911044330.pdf In PDF document text
    • http://ipayon.com/root/FCKeditor/file/vavuki.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161427bbaf35aa---55498094115.pdfIn PDF document text
    • http://slsnn.ru/content/files/93621608563.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/xilazexumukepobodafoge.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/fabusozu.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/revidanexegugawitikefub.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/vawuga.pdfIn PDF document text
    • http://tykhchem.com/upload/files/getemurobu.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/gejosavuxutebajotiluna.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0352853001631356152.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd67891590---zavavigetajofagirumib.pdfIn PDF document text
    • https://galafrica.actstudio.ro/app/webroot/ckupload/files/fudabifezikakadarave.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/putenelak.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/70780414192.pdfIn PDF document text
    • http://4bx.pl/public/file/53354320754.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/59692687196.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/pasalarijebeti.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/zigunadoz.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd013c87e9---nopekaloj.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/tevosojagov.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/35055614718.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/57060784136.pdfIn PDF document text
    • http://maxbrio.kr/files/files/34432536186.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/dl813iudova94i4ggdafqjfb45/42179000385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bollywood+mp4+movies+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_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 17376 bytes
SHA-256: 9be05111f7c695e075526ff2ca8de2d368d4336c03d556a83b3a7d741235f472
font_01_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 10752 bytes
SHA-256: 236bcdf85b6e86b62dfb451fac2cd138272efd2aec6045911f55c14ef1e70f94
font_02_sfnt_off00012999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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