Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b655d301033034e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 07:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25f138bb9a6eecefbb9b87443be91c84 SHA-1: ea97e399a3831c9b947edac413b3b2e7aefbb00e SHA-256: 9b655d301033034ef0a866701396fbd8d857ea2e6ba3812e05a85eadcc22e249
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised or disposable domains, suggesting a link farm designed to distribute malware or phish users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/81513ae439a494760a7a6ead0339fa44/68750982766.pdf In PDF document text
    • http://zlhk.ru/upload_picture/file/39066728040.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/24204302503.pdfIn PDF document text
    • http://innotack.com/userfiles/files/pizologabiporid.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/51fc08521f04918ea5fde6a0912c1446/65819588100.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/zawifigenijesikewijomomap.pdfIn PDF document text
    • http://rafaelokazakov.com/file/giwikajovimeg.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/vuximeguvivekujoxewol.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b67a51b7---19627294047.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2e533b994---55940927256.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/minog.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb082b8d2c---33125529736.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d635c095c30---fuzivulo.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/xeperolubiwolexenevap.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/kiwisuludap.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/75278754927.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c780dc09cc---zoxapogomije.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/20621016268.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611923daf0f5a---77651690142.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0c486b7f1---36856454353.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8a3b5b127---57624944561.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/68011328271.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/28630682366.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/punekuxifasixobinidaradin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=download+nuance+pdf+converter+professional+7+gratisPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/venakixezuwegoxo.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_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 16960 bytes
SHA-256: 686843e063f7ee403c2c630488fb88b7d3f2b3bc720dcb33122213b63d0fdd17
font_01_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 11096 bytes
SHA-256: 3147b2011dc702acea0ce72f4e004f7ebeac12b3f0f75b45b350881139bd6b9b
font_02_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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