Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d0e60149dd9ed1…

MALICIOUS

PDF

118.4 KB Created: 2021-07-24 22:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 521c880a82421cb53e4f658954cfb937 SHA-1: ccc3565dff7dccbb6fa9a7b31f45df288d860146 SHA-256: 42d0e60149dd9ed16ef744b303e6d3c9eb16b402ef9f903444ecdf97bc7d9d15
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and other PDF files, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a distribution point for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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://nokianhakkablue.ru/ckfinder/userfiles/files/74886330178.pdf In PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727289d2e15---69737894054.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/d21eeb4d761fc44cb1b366bb868139a1/zedarasizulujozowenifo.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/91307982092.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gudamafefirimiserefu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160926aef44562---bumifiliruvifa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d41259c73---36505078397.pdfIn PDF document text
    • http://108homed.com/userfiles/files/manov.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7368357b---53567424314.pdfIn PDF document text
    • https://invest.pl/userfiles/file/9567732151.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/31333656388.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/mokoboru.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/76982219120.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/35819168154.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160832024545d8---wosipuxiselipofub.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6990e26a5---miwimoniseju.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1912a2c84dfb0c86ff0b2050448b6497/tixapigataruravitatom.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/fkk3qk5jih0nl7bovvh8t64em7/wavetilotaviwovot.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/47088694085.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6101cc737---15584156572.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609117573761f---burapiv.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/92fiq36jq7cq66jc0871cljkk4/jebevil.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/zonakomi.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/11245533904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cain+and+abel+windows+10+githubPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001638d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1638D 18544 bytes
SHA-256: aae06b0f9193ccf153e19f4d0c901f91aa80fdc20ba0ca7a6633965662d40a99
font_00_sfnt_off00010e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E90 21384 bytes
SHA-256: 94c1a0e4f28d5504b78f99a91639afebdf11cb1749ee7f20dd7883a3db060425
font_01_sfnt_off00014a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A54 10956 bytes
SHA-256: 10a723dd554bc0542b7784282efc2729a7a88699715270c30bd4523ee2f6a6d1
font_03_sfnt_off00018143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18143 19008 bytes
SHA-256: 7222af48846e05cc910e7fc8ffcaa9e04d2029d56602a24a6b09c73604f9f71c
font_04_sfnt_off0001b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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