Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f46e48ced51a88…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 07:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8de99fdd508b1f66bc994b4682602a16 SHA-1: 4c46bfff57d4044518745ba04110c54ac1cfb16f SHA-256: e2f46e48ced51a888fa7806a6a90302dc2b9426458bb60e67c912ca334d2ced3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised or disposable hosting sites, likely to download further malicious content. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic suggest a social engineering tactic to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pphu-joanna.pl/fckpliki/file/zebidimaratekenirojupisal.pdf In PDF document text
    • http://belovosushi.ru/files/51045179966.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/4e5a566672a1985d5a0f378acd3fdb77/77739370291.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/zarefatiguzizakonego.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d61bf7ff6e---gigowakovoledewumuxoz.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/72099566374.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/16666227823.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vse9q23mvh14ts9eufpg3288h7/71574900186.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/5464332394.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210819123037.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613081837e91a---56326674450.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b2ce8557e---15397893075.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2295340ff59adb0f747b312d7c10d86a/bewewibumakoxudevi.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/91582352044.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102b3c4db264---59189428549.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16106ef881a19e---83911842392.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8fc73dcec---biwudovukiviwixedow.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/49564728523.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/modisas.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/bovafonelugusijolip.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb26212c3d---43482136175.pdfIn PDF document text
    • http://soupworld.de/upload/file/limepon.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/uq8lf7n2jes7bfhtfutgah0gog/waxunobowarexil.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a059258dd---koxukivaforutam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=section+138+negotiable+instruments+act+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_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 11708 bytes
SHA-256: c84408a547ed82018227d5770b4dc648f72d00b369a11ea87a74d854210018d9
font_02_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 18140 bytes
SHA-256: 11b262cfd9ca3caeaae540b4570e0eef212737c0d0069854e739d2400cef1b0b

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