Malicious PDF — malware analysis report

Static analysis result for SHA-256 476e5ba1b388579f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 11:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b39f651dfc832bd8a2bf499163bd1e2 SHA-1: 6c016a1cc9d2eaf1d548d1885fad3e1b2078578f SHA-256: 476e5ba1b388579f06615eb90442efbd4aa0917c6587fe68be88c83e007877c3
104 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 functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These factors strongly suggest an intent to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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://trustycctv.com/ckfinder/userfiles/files/peneraforoxonune.pdf In PDF document text
    • https://futurefacesnyc.com/uploads/file/9574678636.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455c299ca1---14188087842.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4r8eq9d7osl5h794b5fiq2tpn5/39106207919.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60fe07f19---47792110990.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7118803607---90473313707.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/vufapoxe.pdfIn PDF document text
    • http://medi-sen.com/files/files/zamitarosupifajonozoweg.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/29958617054.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/98437695012.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/rixabenoliveresa.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/bubakirafuko.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/karusatezigog.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/rusizagi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf3b2e3317---5877355653.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c3b7774eafbd3cb9bdf17883658e88e6/falikis.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee195a1dec3---71904967962.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/92903893465.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/tuzupuvevalovafujumiko.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/dewavotibapivenuvatabute.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/54458205094.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/14385566496.pdfIn PDF document text
    • http://355353.ru/userfiles/file/32741649035.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/jelim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=discovery+3+manual+gearbox+problemsPDF 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_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 17724 bytes
SHA-256: 51092df9afdde25b88f205b03e0d523e92a23df43157255978b8a14571ece5fd
font_01_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001357d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357D 11312 bytes
SHA-256: dd6eb964d29bd68a0cf9aa02398ebb7d2a69eb836b512af1d7f1027432fe2e05

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