Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e10f2754143ee6…

MALICIOUS

PDF

98.2 KB Created: 2021-09-04 01:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a66e491dc978eef248a4620dd86da145 SHA-1: 08269cee6f098c724454b23d27535714b1ac624b SHA-256: 87e10f2754143ee6b438fb03cb9e4ba74940f3958eb731e58681916402a1468f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=tangram+aktuell+2+lektion+1-4+pdf+download PDF link annotation
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/lcnn55lds4c8o4g2rqieoqcll5/natov.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/90987322861b101e0f41fef9cc75e1bd/bamaxiwepotazofinaz.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/88909626050.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/78322855451.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/eff820a7a2bd845ecab72cc0f7407423/89596410200.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/77693148300.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/93504159239.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/reguxisixebivuzuveb.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/59394342421.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/rosamiwegajerogipugez.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/kolapofunesefofixodipuma.pdfIn PDF document text
    • http://ausafe.net/images/art/files/58141540861.pdfIn PDF document text
    • http://kme-kme.cz/files/file/tozozuvowixi.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/14583179227.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/lovukorumezuboko.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/12297824701.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/vulaf.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/66644948027.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0c7a4ca60---temikijid.pdfIn PDF document text
    • https://autoparkalbanese.it/file/90707331920.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mv1sbb72p4hsepkerla5bb9d65/muwedur.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/4608341850.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/webinisogovima.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_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 11196 bytes
SHA-256: afa1ee4334efb51494c385fc4233c21fdc92c447b3f9b2f03111e10b74a7c037
font_02_sfnt_off00013c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C68 24952 bytes
SHA-256: f5abc67d8a3b06fcf4afb9e415388b5742c710f043429ec273d00259f2635ad8

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