Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b922bf56c7c214…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 04:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9538d32ec75f4a560d1b091a417e0eed SHA-1: 6f3e62a44dfc9264c731af604bb2b6b9a7a13158 SHA-256: b8b922bf56c7c2142f6d82b6dea632e7421eccbc257f2c86bf40e01ce9b4ca4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989232d88a6---wuxukobasexaxan.pdf In PDF document text
    • http://ya-ke.cn/admin/upload/fibugajifowamepokomikisad.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5361a79c9---78679165611.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/17307643805.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/denojakumepufugego.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jisilemujo.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/35724486835.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/87842625359.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/pawonerenuwuzuzisidomodat.pdfIn PDF document text
    • http://rhondachem.com/d/files/lufajitiro.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/96506616634.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/sutozesidikenofu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/t0lr4234di26odvb2g15isjan0/81575533059.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad82dbbdb09---bapaxurezetejo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c496ef83d69---bedomajolijepetiko.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/80056669379.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1a753f727d7aa583d9afab8895044e98/40835953940.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/bapepaza.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6b388e8f---nikataxukijasirofigokip.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/nufaginuz.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/b77d742c5f89baf760f31e86448adc2f/lisoferaja.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e54c87b0---18666545356.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/guveguterupofebul.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/107913164b14c399891327b71eaaa921/livugok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=learn+to+type+without+looking+at+the+keysPDF link annotation
    • https://mediaget.com/userfiles/files/74286054322.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E5 16988 bytes
SHA-256: e5138f3c652cdbf96d364f88b9057690663d1a700a11332a35e442add3452d4c
font_01_sfnt_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 16624 bytes
SHA-256: ae8307188cc3f7705628cc9bf91c94d42ec77adc51d5b608f28dbd4c9b0e7c6d
font_02_sfnt_off000117eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 10880 bytes
SHA-256: f1797bef47b20c364f35a165f56fd6be53ea3ccb288fcf0058a00f4547a13abe
font_03_sfnt_off00013113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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