Malicious PDF — malware analysis report

Static analysis result for SHA-256 066d9fca81d29f95…

MALICIOUS

PDF

72.2 KB Created: 2021-09-11 06:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05f6ec80399bec29483f70c507a81d32 SHA-1: 2dbc7738221b831784020f2ab4977514fd2fe754 SHA-256: 066d9fca81d29f95abd6e619bb0e69bffb09fe51e05d9d8085f8a772faeae8ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://studiopol.com/userfiles/files/71678022284.pdf In PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/jojafukimakojaz.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/besojedibatubox.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/7821423456.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390b705e9f3---54099462327.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210905_E4CBB6E47284FD89.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/90229441879.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210903012326.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/594duh0lba7mk310nc9b8gr49a/91441690551.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/44345100755.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/wexawada.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210908071117.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/32549693872.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/jozobolemadosuxe.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906214541703.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/soxegojizaju.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/ponitekipanolibubasorek.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/57754093862.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/wabavijarinusuf.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/kixamurapego.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/kikutew.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/34418224143.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/dilufibon.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4dce1fe82---pudujavirapujakoke.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/jazozizagimisot.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/muxefamekudu.pdfIn PDF document text
    • http://licausi.it/userfiles/files/lajovijabawunut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=game+simulator+mobilPDF 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_off0000bc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4E 15224 bytes
SHA-256: 08ecbb1d4129271f31a6e99aed8a5b86af591dc87388615b29bb673e5e665ba8
font_01_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 10444 bytes
SHA-256: e45ddbc262993e9fd7897a58f98fbf0fd4e44878b22e9c2feefdeb1af43d3601
font_02_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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