Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15bae4c3ab2e5f2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 23:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 116a8417421e352059f7627f6701ed7d SHA-1: a3575a296a7cb3063730e4bb52a861b638b8eb83 SHA-256: a15bae4c3ab2e5f22c78cc3e6f72c6408c42d8307acc2dacc6864a79d0a42ab7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4648c2b6b---nokegifukamozasum.pdf In PDF document text
    • https://sunnyrosesschool.com/userfiles/file/36109720599.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/95824475581.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161321be753a33---gufotesibotakesuvevovape.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/45646035912.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/46069066885.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/xatenadeluzojijofozezata.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/63716164919.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/sokegojini.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/95152523876.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/53929463448.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///22079154388.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613659a479963---12693296040.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/03/81094409677.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/81404023424.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/72d90628bac2d0d857aa00055982d2c4/luxazo.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/64792764990.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/gudafogo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbafd9e84---lofolukibefezotag.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/nolotijisoraxufapigi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/737f7e10944c9006c41330108e9628ff/52769063074.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/30325275435.pdfIn PDF document text
    • https://zzhqhi.com/d/files/xizinifufanuzuvizij.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/97349780678.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613416339e728---xudelarafekawukulijadim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=thoptv+38+apkPDF 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_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 10208 bytes
SHA-256: 8a89c80aa813d3d20dbe7f936a3f1343dd8d82b091045e37088ba6cdbe68664e
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 17336 bytes
SHA-256: 995ffd2f2188cbde7eb61782af4404dfb21ba73f764358680a488eb481a81784

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