Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdf6e994e5ecd15…

MALICIOUS

PDF

127.0 KB Created: 2021-08-12 07:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76fd6e56b546b0b8ead5921c862845d2 SHA-1: 27e8bf8ba32f871653054d97bfddac6823a1402c SHA-256: 8fdf6e994e5ecd15a57784c30046698a5cbfaa85c77d6877f4685e9ec573d670
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other domains hosting PDF files. This structure suggests the document functions as a link farm, designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://bonacorsi.it/file/lazizinukenujonemerom.pdf In PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a5205d4f---54698901729.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/bogedomerenota.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/20946630088.pdfIn PDF document text
    • http://bakoca.hu/files/file/16004045828.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d2fe6817---gizos.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/44370621615.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/sakevena.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac57a39c9---nobadibopiraz.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b773426cd---sogavi.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e0d685085b8f8d223ef86303f2de868a/sanexikara.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/jupixojobavurekezivenu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a596e212---butimunij.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9179377a2---sufajizabatosu.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f0839d8dac63ac66a69a395c5877482a/vaduzovagemebizit.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/pp8kescm0s1pbuok4v2e652510/jevedutaw.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a53eeaba---42249189934.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/64543112541.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/51539925279.pdfIn PDF document text
    • http://araonline.hu/uploads/file/zezakinaromejapit.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/bavunorimolex.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/68590342952.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4862359715.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/84312987611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+are+the+highest+ranks+in+the+us+militaryPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/11385161348.pdfIn PDF document text
    • 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_off0001914d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1914D 16808 bytes
SHA-256: 5cba5d1ff47e00ae5237cc67e0f22a7a440cbe8170189a94fd2f3d1f4d46a5bf
font_01_sfnt_off0001bd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D524 10732 bytes
SHA-256: 4ea563999e458e4551c5a9ad279aa56b66c6e5c4a300515cc36fc940ce9bf4d2

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