Malicious PDF — malware analysis report

Static analysis result for SHA-256 053eb1c2df7268b3…

MALICIOUS

PDF

75.8 KB Created: 2021-07-06 23:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e3d36ab5541dacec8e7a10fca65533f1 SHA-1: d16f09b47172785d3c9d98af31364b0d3a014b54 SHA-256: 053eb1c2df7268b3dfb21ba2a50272b8d3bcb1e93e376daeaf7c8ae3f217a2b7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. This suggests the document is designed to act as a link farm, potentially leading users to malicious websites or phishing attempts. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://wastran.ru/uplcv?utm_term=grade+8+soccer+referee+test+answers PDF link annotation
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c456334f181---bekevos.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/dukumugodu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/j47c2273nasu1egn2b2jm3cd7v/ropafaxufifok.pdfIn PDF document text
    • http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/85823277190.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/nalabevekar.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a4b57f924---zuzerux.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160844406bde1b---vutedok.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe14b9c7b---92142670862.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/sixajiralebux.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9e7631928---nulipinakapigukile.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098520baacab---muxusavezo.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/pafir.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/patosixoworarupedubofapeg.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5e5d3087a---zimupon.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/gatepuwu.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/41872812453.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/04518edeeaddb51b942817a8ee336aec/tagiwovoxivavidibukafofub.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210612_9C1EF7221692B0C9.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/1273354544.pdfIn PDF document text
    • https://senfina.top/uploads/files/libolejikaxagaximuvavafip.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bdmps1sul0tfpik9nu5s3f3kr3/46399101047.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094da10b20b0---47540671179.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/43741936862.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f3b26910ed9b1d9901a110f768da1c06/divusekupisigukawuva.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe29b14076---mapovebuguruvago.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 16568 bytes
SHA-256: a5c0146798d2a7b44634c3aee3fff885d59804bf404abea25b18cd18387519b8
font_02_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 10664 bytes
SHA-256: 3b710c712621a91d8312cbc4278690dd06c2e5135fd24bfdf2af9dd308d52789

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