Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6137d7c5132628…

MALICIOUS

PDF

113.8 KB Created: 2021-09-08 04:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4320bc80862a918bc899653cf7bec7db SHA-1: 039e7be06dd328488e82aa94b72ac3c9c0d1ccac SHA-256: 9f6137d7c51326289a276cff12dec7be206ecd815f9b94a7e2cb10c04ceda831
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests the document's primary purpose is to redirect users to external, untrusted resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nowyhotelik.pl/userfiles/file/xefekigemegoloxusiwix.pdf In PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/16466164840.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/79822672033.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/85726542273.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/6759803071.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/41307654266.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3f6ab2dea28143a994605936618f64c3/povafovabap.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f377e512---40170557791.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607222200e3e1---27669915545.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1625598079libadupam.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/jefigixifugofuzizafumil.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de07744bc---56817482106.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62030b5b99---dadokubimozinoxewekizem.pdfIn PDF document text
    • http://valeneighbors.com/userimages/kawowete.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d216753a9a368901709e59943144e576/jokedogera.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/biwiponu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/438beb5d6646e7b0afcfc014907b3943/forudokafoxinadame.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a16ab449f0---luxomibefoferigili.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03e8a88e8c---15989263831.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/577cef8bae8ed7c6e1e8691d5f8ac3c5/6637991773.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3321042ea---naxibomukudolinopaxuju.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/5659536532.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ena2mbhrrfreoek15h7rs2g8jk/57744623048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=de+amicitia+cicerone+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_off000156cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE3 10568 bytes
SHA-256: 7bb114f82f4077d969b5b487a1958ed4947b94447bdb8c3d637d0f95f9af0307
font_02_sfnt_off000186f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186F0 19376 bytes
SHA-256: 54650a0746d05c7e2b2726fa0cb8b3d882cc455400aa805029e87ae386f8ddca

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