Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8410cf5277847d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 22:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 273ce600b58907ccd0ecca8e586d3ab4 SHA-1: cc4808bf6a95887a6a752460a58cd5174b7ac9da SHA-256: ce8410cf5277847d2f34816be10083efdc945569dab1c93ab61be82b28b38468
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=smartphone+bd+price PDF link annotation
    • http://dokumsuzgec.com/userfiles/files/mukunebovosurosirujojofo.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kowazugokevizonewaxodup.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/xebiwifujejumesata.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/gutabukonak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338c6daddc8---kusabenagonilulokad.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/sadenosejunuxif.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/71213279952.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63440048927.pdfIn PDF document text
    • http://wohingltd.com/userfiles/tazadegarafod.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/kenojipawapovowebejati.pdfIn PDF document text
    • http://veaodaibrahma.com/uploads/image/files/6826212820.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/milepopomutewa.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/18014986986.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/siwuvatobe.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/mavojipibu.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/bujabebumo.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/67531528756.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/62152295319.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6d3db101---48015568794.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/tutorig.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6ff0a814---16296701715.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/19746724170.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/11671411587.pdfIn PDF document text
    • http://opsir.eu/files/file/razututixusobevu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8372acb4d---podofuroje.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2c5cb328b88612c7447408106478d138/wobubexin.pdfIn PDF document text
    • 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_off0000bd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8C 10780 bytes
SHA-256: 52f59f6ad0cad9142644923f1e205361ca13a35bf4b85b69a1426a2a7330d688
font_01_sfnt_off0000d5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 16944 bytes
SHA-256: 10f41354c314a090f7e131b046261cafa4088f9d989135566ac2a84b0873cb3d
font_02_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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