Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd31de33109193b9…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 20:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8856c1791a2c75e1b20cbad64b9e074c SHA-1: c56fa0957830d1735dbc91436d2df152d9672434 SHA-256: bd31de33109193b959e5bcfb1bbec10bc3641269cfcfbe356bab972793d7ebd7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of these links and the detection as a trojan strongly suggest an intent to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37d2a2c5ad---bubewizoreseralarolota.pdf In PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074210b69049---36788550306.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131db9a500b6---65924107601.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/26547455887.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58383525590.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/13852413077.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/55559631429.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28118064569.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f2d3d4cd4---96811473344.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/78077248899.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/54087066228.pdfIn PDF document text
    • http://axwelindia.com/uploads/56747807018.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/52327676861.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/gixanaguxalogiwupo.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/gokuximodemegor.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc817dc18---4885368721.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/pusibejogivaveziput.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/81745483908.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/c3hemde0ihftbrov884oulgrk2/penuluvoludowu.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc31ac4e3---27633773126.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/46197297840.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/bisugivigawapoz.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/dorofox.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ec44c207a9a---36639736928.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab0a14fbf---75216267705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=house+rooms+esl+worksheetsPDF 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_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 10284 bytes
SHA-256: f37ad296f8d82b8832b5fc249a0acdeb588cb9ff5e9fe1cf710107d423b5c991
font_01_sfnt_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 17836 bytes
SHA-256: e7fda9f7659618eda50b0746b294e5aabc2db8bbd0888155ad0cdfa6ac9b32a5
font_02_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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