Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a82df67561ce29a…

MALICIOUS

PDF

83.3 KB Created: 2021-10-22 13:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18e2a5ea7a59bf92ce49c5bb2fd5c864 SHA-1: e51f4ea44da09c2ad7b7fcd2ce7689fae965bb8c SHA-256: 2a82df67561ce29a3112704ac8e6bbcdcbae9e4cbe83f656810e5ca1f5f5778f
176 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of a QR code lure further supports a phishing or redirection-based attack pattern.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inprovitparaguay.com/ckfinder/userfiles/files/mikiwoxus.pdf In PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161584766d9e10---noxivipezit.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/27443115913.pdfIn PDF document text
    • http://quetthe.com/upload/files/demerupakokegazexulafowi.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/luwuruzijozoxu.pdfIn PDF document text
    • http://yejida.com/userfiles/file/55665230606.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/netup.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/22536443517.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/pifabezevixiwumirupul.pdfIn PDF document text
    • https://ebooksweb.net/files/file/87256003591.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/nuzulawu.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202108312258186991.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/48116738156.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/82912523805.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/25ee297743af460faac0abf05dba6f43/rarigulanu.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/dunolapodunasiwusosasip.pdfIn PDF document text
    • http://att-na.com/upload/92083869430.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f6b1750d6---99527904565.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614587f1965fe---zonakabewidirogesofefo.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/86174872700.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/13716871900.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/94737375390.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/42934331419.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/xamopuni.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/sonibemudelajeni.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/UsNeCLCzgYg/uplcv?utm_term=71mm+to+inches+fractionPDF 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_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 10560 bytes
SHA-256: cde1a7e07b419fa9251e1a7d15acf31072971b6d274844ebbff40d9b847fd336
font_02_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 18776 bytes
SHA-256: a509f97b83d74dedb8ca7abeb5e72ed742d2ef38755195f74db3806fe112caba

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