Malicious PDF — malware analysis report

Static analysis result for SHA-256 595a6d652a5f8d69…

MALICIOUS

PDF

92.6 KB Created: 2021-08-15 16:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 8bce68e6aea1b7c640ba9aceb7ac7fe2 SHA-1: 2d28af70d1423ceffec0a0a24b831b2b83a43584 SHA-256: 595a6d652a5f8d6998717ca4adc98148d9296d2d7e74fe16d5b48bcdcdeb18d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/nejubasowesenul.pdf In PDF document text
    • http://guanzhuli.com/userfiles/file/sekusetozezitilujikileja.pdfIn PDF document text
    • http://goldmustang.com/files/files/48814597480.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/zirafajuwanujerosazopil.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608084827f580---57046333418.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/4809849942.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1622790519556430426.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/boxubapotu.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d4b3d9a3---40045202160.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/57995666146.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087076fb36b5---lemudugakinevam.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac722de3e14---86320057254.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/97771498685.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/58830134628.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/10318079696.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1b8c8d2fd---49989457274.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/zaxewiravoxalijaxowapun.pdfIn PDF document text
    • http://koronowskasm.pl/file/20408405882.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4366b1fe41e55345ac64b62a85afb8f1/sotilogojijupovuruziso.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b5ea5fa8f6172fd7ed503b55eacc395e/genowir.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f9b77d300---zopobuwuniwivodasoma.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/52ks9ivr28n1ikpdfklm8hdnb4/53253108072.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8b2da910d4f5fe1d67cc22d4b6237425/pupewe.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d768973e---91627152844.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/3smf6ma9ichdc67o7ihvsdjfp0/veramagukujizuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=martial+peak+novela+pdf+descargarPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 18728 bytes
SHA-256: f10a1aa661d02cbdfba79ae45d9e03b53e87fde5d4a995731034d45064482ecd
font_01_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0A 10944 bytes
SHA-256: 6c327e979bc89820aeb3accae90d435f7826d73eecaef9c24476d96e5f70a6cc
font_03_sfnt_off00015759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15759 3120 bytes
SHA-256: bcdd70ee5add81165c1b58fd141287ae104a4641c2ccd8beba687c578436ca3d

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