Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3ec296559a2411…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 22:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27740ae588e5294679e3ecf2c480bc5b SHA-1: d7cf165fc56a7eae6118473f182d925e7f208b10 SHA-256: 6a3ec296559a2411a6392c9624d5b39b3ff6cba77eee0434ea3d5c3e1a4a3acd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document's primary purpose is to redirect users to external, untrusted URLs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://airsoft1.ro/files/file/livutubimepifunovojari.pdf In PDF document text
    • http://abnig.friendship-match.com/upload/files/topigenafakekorofumivinuz.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb59edb877---77265205535.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/59441503488.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a6ab9289---58908963058.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/25395092685.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b3a69ef73---76204890510.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/xudap.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/kajotipesa.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210715164449.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/a52pk4t6uolstccf8d7e5c8c92/wujebubojezexibimanifide.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/dazixepajaz.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/5835801759.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/61308523824.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/ninipewovoti.pdfIn PDF document text
    • http://candientuvibra.com/images/file/soxoredelokusilitira.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/86176316994.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/zeponejuxugupofote.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/36597663556.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/55080402662.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4eb11e13---jiravagufiwavezabujeb.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/ruzenilanogos.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/rovakubanujunifen.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/10274728149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=aiag+msa+4th+edition+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_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 10856 bytes
SHA-256: 5df5987807f54059dcd1b7d21147adea0150eb719ddbb9e415f09da89894476f
font_01_sfnt_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 18356 bytes
SHA-256: b888dc9bc466d2082d65a85ddfc1d7a50dbb9265491f971a71d2059b7d5ac364

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