Malicious PDF — malware analysis report

Static analysis result for SHA-256 652f5b3b2ee18dc4…

MALICIOUS

PDF

94.0 KB Created: 2021-06-29 04:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c29512dec6cacaa211bf67fe73444e02 SHA-1: 413ba584ed8d1ad9596e3cec480724d19934fae6 SHA-256: 652f5b3b2ee18dc48067b32083b9ae3f1b6db255ef4889f1a39950c53719bd6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=to+be+meant+to PDF link annotation
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d875da5215c---82243120445.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/hkei16d99v2kkrrvpjqqkfu7ds/6122062698.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/t450d4plmeld8n5r361husd946/19036571735.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/rumonitavazalaju.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/40748396882.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/s8dgaci8r5dptl8j5kcuokcif9/mijuketedelefugilepivu.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/pn3iqvugp403mq2huojo3ffuf6/56923282110.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/2465672350.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/v48sqonieis1lnpeantvfdfkug/28279216800.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/34323594589.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///86295443175.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db02aeb9df---zovaxiw.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df432bc496---logisosixikaxi.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/18d9080bd0863990838c174ff58a6231/86873757649.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c75579b080---xuwununifuvof.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/nipabuzumeso.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/femasofibaviv.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/96a8a16cba1115d3475d90d57d45ee19/refuwamufaje.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb6644c3e---14085243808.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/xipiwunalulinosopekin.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ngogqfq0vfirltrcdvedqpumni/dugepiwinopireluxekobimom.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/08a3d0686af2de2c87efcd16f0c37af3/wesesaz.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/xukowixuzovabojeto.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/48326592574.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 4964 bytes
SHA-256: 697c126b5ecb38281fcb4d1b8fc926651574d8100238db289dcfe37de9b229dc
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 9968 bytes
SHA-256: 87b1b1edd6ee3c5cb4600ba077dd0e172da99ca608ec3ec8413287537593d1a7
font_02_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 18452 bytes
SHA-256: adcf28c0662cb78690bbfaaf9c6310abb7b6b5819c531711251d7f32e8e56751
font_03_sfnt_off000122ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EF 17936 bytes
SHA-256: fd6446990fdd40ad23a5a9c974e9f4189caabbe2a5cb947bb0b4e1d32770c1bd
font_04_sfnt_off000151e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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