Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4ba3a1d0aa6001…

MALICIOUS

PDF

91.5 KB Created: 2021-08-13 00:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8a60e0c37d4c3b2a3f833c3d14ee5aa SHA-1: 1f70d83cba55e8e623c97bdee8e122a30c73016a SHA-256: bd4ba3a1d0aa6001a3d1bb4b9d76d17bf80a80ca176da76bd6132536bdf22659
164 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple disposable hosting sites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document body being unreadable due to obfuscation or corruption. The presence of numerous unknown URLs associated with compromised CMS uploads and link farms reinforces the phishing and malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://k-sta.kr/FileData/ckfinder/files/20210812_9586877AC7935522.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/031b7d94bcc4e8bf453f8b2d2587bf4b/zavalaxeronijugipedot.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/afee6481eaa81d930f028edd4a9c4cde/zusefavovedufoxamof.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/litifedidenexotojafazaro.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/foregiwolomase.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b943e1a941---99838301687.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/sapanisakixefimelumomori.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/wovoriwuki.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/66908929984.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bafcdbdaf64---sejejivukogisajesak.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/tejivomumop.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc17e1f21---xevuduwikavexojotaras.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/2370c0fcba9e3c026b59a754591d98eb/26197233303.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd78bdbfa---88921982239.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf90b8137f---jivesakugovirezofi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c842b34f---75468398037.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/lusobuvimimujajixoxo.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/o164lkm7364sb5939dlc1n76jm/52112182349.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16078a680316ce---mavobemuru.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f1d96169fdeea41e5c3386374d46983d/3471290678.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/vurefenosumisorolasirazov.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/61758476544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=free+download+any+video+converter+for+macbook+proPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 16784 bytes
SHA-256: 966f6bbc3994c19ddd4f581dee1ebb0c4796957de4d04d0563bc706c939a0e1c
font_01_sfnt_off00012e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14640 11088 bytes
SHA-256: d7284794b8fc8aa1d09d5298c9bd5ad42ef4a0bb245856883fff0c9a55ce8993

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