Malicious PDF — malware analysis report

Static analysis result for SHA-256 1756962c31a9b732…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 01:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8bd7497f8c9d1cefdbc0e42f2b81a952 SHA-1: 1cba2dec44566c1bd3c0c4fc2167d6459752d77b SHA-256: 1756962c31a9b732fefcb6e9bf28026b0391d0c6b613fca1b3fc12ac8679fbf4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of hosting potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cafesezony.ru/fck_editor_files/files/47106481946.pdf In PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4675769f926be3d7a4a0f4685ff1f25b/dinemodizafi.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/14327557687.pdfIn PDF document text
    • http://healthywithhart.com/res/file/84756998798.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/29540692975.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/72028740212.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/21039957045.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/riwupi.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/56117253123.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/20158736381.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/naxavawibijuxoni.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1ut53qm37r9l3t2a3s63mr7og5/xekexemusebelidij.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210908_133525.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/jedigibalefomibavuta.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614609d772630---nedurilu.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/xupadiwibewasupov.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/raxufunepetibazik.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/12467687296.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-6/20210906053107640052.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/fewusanenoxofenifi.pdfIn PDF document text
    • http://lachina.cn/upload/file/32155706383.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/kupozuxiwufemivasawaravo.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/97923467834.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/lewoliwutemokemu.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/vidab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pok%C3%A9mon+go+gps+not+found+11+iphonePDF 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_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 17820 bytes
SHA-256: bd00627c40445cc77c04fa68da1c0e5782cc9c92b14b47bce5e27569c4d36977
font_02_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 11036 bytes
SHA-256: 00f861eccb8a626c9ffbde456ff6e7782c9f10cba79b5b3dbb74bdb47dce2d7a

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