Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefa071b3cf45542…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 17:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3310a575c39ef4d806128781db25b1c SHA-1: 942de45dacfc81507920e9ceda14bcb8c1e2db71 SHA-256: eefa071b3cf4554276c2fe7d61cbcd0a301baa538e033758eac7362e32400094
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://catamma.ru/uplcv?utm_term=nespresso+expert+manual+portugues PDF link annotation
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb59667852---kagumapawozanuze.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/xepuvuwobumofixut.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b2bc1a9dcb7535980dcea360f45e9f7b/kawexibilejo.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/94468236238.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110a7f50be85---guloduwosozorikexopor.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/13612066447.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/79282285604.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/kavikup.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/95734844933.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/91088634689.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19dfb0681---73156434151.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/tugipabalinutidifusudonun.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec3cdb7585---roxolazutaburula.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0701e58f46---sobipedijug.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/604754a344262195846db5d2cdbe20b0/rivegonazalufabogaxufe.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/70186444287.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/kowusevafeta.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/66690698619.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/32637211450.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/ruvawasurosinawuforazuwin.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/14070247835.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/23877673852.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_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 19248 bytes
SHA-256: 05533fcef180cd8dff827f08cd49e92f4c4bdcc415c1732189a118f4da33d702
font_01_sfnt_off00010ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 10684 bytes
SHA-256: ca89a885f18b5a2f47d5684d18ff238e78f510a6d1aa4db2f55590f50b8d581e

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