Malicious PDF — malware analysis report

Static analysis result for SHA-256 5662503ca1b0ace5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 11:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acf94b3e1e5f5cbfa1b138a59dbbe8aa SHA-1: 20b9ecfda8f839a26bd3881c1a9c094392ad5d4a SHA-256: 5662503ca1b0ace5d07352c3fe04bb8986a929bba492dfebe9a6422832d70134
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified multiple external URIs, including links to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of numerous links points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.css-jp.com/upfile/files/2021/09/10/8857693386.pdf In PDF document text
    • https://mokhalasati.com/userfiles/files/wabakadamuwuletovuloxup.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ccd7m8spo13ksnqaunfkthj0ei/zesatuvurupexamarot.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f1bfdddb1ce4db5e8509f9d353b428e4/dagowamumusof.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/lobasugetekuwukax.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/lumugonusekezabobetiwit.pdfIn PDF document text
    • http://grimastone.ru/files/mejigafizewesefazekuraza.pdfIn PDF document text
    • https://kham.vn/userfiles/file/73335305695.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gh1r1hd1b4kji0hdafi0imipu4/lunupuron.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/doganut.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/kijuvisafifa.pdfIn PDF document text
    • https://digireg.cz/upload/lasafejilokibebe.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/rufugepuf.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109030413257881.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/27347443004.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210907_B860DFD8286DD568.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/50266071666.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b838930d9e---jamuforunovomisofa.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/vobopitasoragunatalaj.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/434044884.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/mejejivurodosapimirez.pdfIn PDF document text
    • https://cmoretv.com/userfiles/bixijorojenetosokuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=operations+management+gerard+cachon+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_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 17692 bytes
SHA-256: 94d5de3a899877006dc48db5b169f93b52670539ddce8b0c2594855aa6e5a125
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 11048 bytes
SHA-256: 282644a0cd89a037e2111cb1f6387d195e8c127a56326583e452ca961a01b60b

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