Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc1dcac7a394de7…

MALICIOUS

PDF

141.1 KB Created: 2021-06-30 10:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 588c6ae7af0b465b83f8e21d65439ebf SHA-1: cb8785d4ef82c6ec56d40260279acb9fbcaf64c2 SHA-256: 8fc1dcac7a394de7be14bbe49b72cfae265902f0ea2620e71d34d36960d2b1a8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised WordPress upload directories, suggesting it is used to distribute further malicious content or lead users to phishing sites. The presence of multiple external URIs and compromised CMS upload links indicates a deliberate attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8742

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 https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/039b9404d5eb1fd5173f4616bac33162/48369422720.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/cde305053b684f34767cebbd492f454d/zegidonuvagajemewirotekab.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aba211f367a---maraposunep.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b71929c9a4---xejili.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/67061499861.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d6e8b9001467a6e920e45b174f8a0357/moledaxovov.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210524115327.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0b3b3dcb61c2aa124bbedbc0c5bc8c12/zadepojereninet.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/29eaebe335b3a8e4c314e290a3908cc0/79776987260.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/93421070725.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd1501e822---guxokegaka.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/m0kvencfb3r87uei260mmh00sn/71639669243.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/62546099582.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1ii0g7i0h3bpcedoh34jbi07ml/wafujavedewaxenuronimopu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/pegimawitideku.pdfIn PDF document text
    • http://kaies.cn/upfiles/210619131345949751gborty.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/ribupisivarevozevuzovu.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/12610235920.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/4163432619.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73cfd6a50a---supepali.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c77bc3cca2ce3ea9bb0b026500215daf/36029594485.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/dce1f484f0935fbf5a0256f421a09ae4/10005131584.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/futudesumabazelaxurepo.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/7cea6c95b47830dd2412285933b8e84b/pisuraji.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/198b5712a0ea82aae57ad42fb2551dd9/65834517595.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6863324c8fc5fe4802ecd8cdf54a5ff6/tubilot.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/lds7gp5pia4k0u16serra0g0ab/wanuzujogabano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=my+love+from+the+ocean+episode+1PDF 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
font_00_sfnt_off000196b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001aec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEC7 20848 bytes
SHA-256: e41c0aa11c96116c7f8d7455530fc082db0840159f480bfa664fb4bd9491c039
font_02_sfnt_off0001e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E320 4632 bytes
SHA-256: f66d1ecbd967849215b3ca7f4aefebf2fabba4bbd8edf9595fb64b8d931cda0d
font_03_sfnt_off0001f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F423 16216 bytes
SHA-256: 8c2e9d80d580d08964a5048de7b59c27befd741f1c379efd0abbd599686b3e88
font_04_sfnt_off000209d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209D1 11108 bytes
SHA-256: 436dd17de3c47a0f0d207cc9efea37fae8617e8769024347202e3b8c691a7a2b

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