Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98f144574bf912c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 04:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d58a1526bd037f7054bc07971a7f178 SHA-1: f20e85e90b27cde1d0287f4229e1fca8f8a39523 SHA-256: d98f144574bf912ce35bab92ac75c8dab1f8a0fe7f088e5979072923d970f246
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure itself suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://parquesanalbertohurtado.cl/ckfinder/userfiles/files/matemedosepuki.pdf In PDF document text
    • https://lesfeesdelhetre.fr/upload/files/kivagisipit.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/girofava.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/49480798951.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/9f8c5cd843d37e9f4f471dc73ef68c27/78699331637.pdfIn PDF document text
    • http://findacommodity.com/upload/file/jamusox.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980f0f0374e---3488113322.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/59157695764.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13551065311.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/2t2shdgfdvsr6l2mq0b0dtti16/33193663470.pdfIn PDF document text
    • https://ferropula.hr/files/52912251325.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/t70um3ggtneqoui15qpfpnsclt/31238183502.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/to1t674othoms3v86amiep27tj/28499460217.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/gojujaxanuja.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/96017710393.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/66421398336.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085cddbd0e97---bipumugez.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/69259484956.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/wudaped.pdfIn PDF document text
    • http://xenangheli.vn/public/files/33679527714.pdfIn PDF document text
    • http://soupworld.de/upload/file/3101436515.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/negumomuroxalidizulad.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160991f33e5b36---37385128016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=patent+amendment+act+2002+pdfPDF 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_off0000d37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 18352 bytes
SHA-256: 9897b540c9a76f86f20734b89a7fc0d84242f353278f53ed136d0840be9a763f
font_01_sfnt_off0001026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 10500 bytes
SHA-256: 0f263f97a388ba15a32ecc2e664969b826c1c40b70a59574a0536709abee00d1
font_02_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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