Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48dd62c0e6388b2…

MALICIOUS

PDF

89.4 KB Created: 2021-07-03 06:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3f66f897fa7e76f59bd7a0c1a088d8cb SHA-1: 4ba5305323d0cf5fd3389a6ac1545b768c46645f SHA-256: d48dd62c0e6388b2aa328fb4410a2e6daac2f3ad5a3506d066cf14bef5d8fd86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised CMS uploads, indicating it functions as a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a792664d292---45170116726.pdf In PDF document text
    • https://kurtoglumob.com/upload/file/22481166800.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a461c841589---notegusuwu.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/575f191f87ea9ad9fede9ef3484528b7/36211605094.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb785a9088---nubokaxiredisusigal.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/kawovi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607266a30d3f5---7555947376.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c3a8ac649---wenez.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072b86502a7c---kipebala.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210624130126.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/cb3fb33b22db3f7cecc10d62e2779d14/11967732611.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609503fe907db---80270735346.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/fixamonetitasamujem.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b67758179---53366654075.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddcc1808bc---14825562966.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/ximotegibosi.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/84bcbabc89173eba5bd4e7467fd058f7/94350622960.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/26839625562.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/ruzuvinitetepevusuz.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/88982893678.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/zajeguje.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e5d8330d84c1e8ba8b1adcc0b928ccaa/26732063783.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/f1e86l8srosuh578fckk5bdv8q/28770925303.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6jpue5nrfdksfuj6q3ka8jm2kl/48692272321.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/xakomoniniforolaxazekebul.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/9734629851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=coughing+up+chunky+phlegmPDF 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_off0000fb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 17088 bytes
SHA-256: d8bdd9a94ca7668c2a548b700843b1c934e0ee7ef6f0444f6a46054b38c1e846
font_02_sfnt_off00013fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE7 10632 bytes
SHA-256: 18cb862c17e12f4ae48d0bd525ec62769d5aa544cd8730b676cefb6cf19099d1