Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ea29fdd2c72a81…

MALICIOUS

PDF

85.8 KB Created: 2021-07-25 19:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c55f775c906ecb5d94d9184ea0aab94a SHA-1: fc129ac099b0ed70770d70103aafa9a5b0a925df SHA-256: 24ea29fdd2c72a81c06a72fa0390dc15b2fb57fa998d9bf99b4960238c7a34cf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous websites, many of which appear to be compromised or disposable hosting. The primary function seems to be redirecting users to external sites, potentially for phishing or SEO spam. No scripts were extracted, but the structure and URL patterns suggest a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/73119903848.pdf In PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/67886274446.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-27/20210527011432620342.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/18332197163.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/powurodep.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/80577197025.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609430cbef420---48012928375.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16090ea16e926a---53779580507.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/4719649529.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/69278810002.pdfIn PDF document text
    • http://cichanski.com/Upload/file/vetapolajuni.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/651638174.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/xagatadawuwuvuxexubozig.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/62684326647.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/efb5db97d510a77a7b71f577492dcea5/basagipovefekidakiwiduf.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/274c78252dd6e1aa2a677881abadebe3/suxewaz.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/niberobifafoxaxitagur.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16098908b8b568---30753482885.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/22689302706.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa447b848---konejonaritesemomune.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/xotuliweb.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e834b73b27e---zumivewajerivovazada.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bf767e770---62868749781.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/53199807663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+italian+pizza+dough+recipe+gennaroPDF 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_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 17684 bytes
SHA-256: 7157ef8af7f2a07f56b1b26ebc44306579ef7b235ca43d324c75838920677397
font_01_sfnt_off00011926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 11004 bytes
SHA-256: 95e120ea468154e3bb2ff51617f180687e9f7dc9196f1f2d01770554c49a9021
font_02_sfnt_off00013282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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