Malicious PDF — malware analysis report

Static analysis result for SHA-256 003bf61163de360d…

MALICIOUS

PDF

81.2 KB Created: 2021-08-17 07:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cdf4a96388e35fb5b71698e1b2fa5b3 SHA-1: 08101a4c731dcd2dbe53a313b55602b5dfae20b7 SHA-256: 003bf61163de360de94550bac0e6ef3adb935287da98f7cbe0028fe2845ddc80
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://marmaraisg.com/images_upload/files/1799302478.pdf In PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/vosukatosarifafonaxitira.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210601091520.pdfIn PDF document text
    • https://plasy.com/uploads/file/97888873932.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qb20pu8jg1ca1316vp39rdvo26/bamujorat.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/72544639744.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f696cab18b1cab3eec9a893e8598cb9a/9515424943.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fepixe.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/43926911554.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091dc69be0f0---31599392507.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/79007809647.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a231949b0bb---55527827048.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/safal.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ab52a9eca608d2236c2a5be77a135631/27461538833.pdfIn PDF document text
    • https://panama4d.com/contents//files/jojipanemularuperefawe.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/22414043812.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/dewilisefavapewa.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c8c2c3f39---11237952063.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/11673887685.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/redibapanasavamiboki.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e50abb2c1---dodabananekuxupupalaxo.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/rewubefa.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a352c028589121eceb8fe963dd5525e6/jiroxubevogeroluki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fever+code+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_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 16484 bytes
SHA-256: 9aafd4f99c27e54a00dd66bc6c2d2aebe4276bea09b9fcdc7e924bb777e29b13
font_01_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 9984 bytes
SHA-256: 87874fce3532a81ea3bcf63d7936931c4efbf8d597307e3e6e7e890dcd82b132

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