Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20542d6fa9a4a32…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 09:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db3c37f4105c870b1ff1553006de05b8 SHA-1: f7c58ca1146d219e317aa540d7a6a9806f6d080d SHA-256: f20542d6fa9a4a320bd573b0ef7307e25eba96f476f3ef10be41f17c05f935dc
172 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript that likely redirects to external URLs, as indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. Several heuristics point to the PDF acting as a link farm, with many URLs hosted on potentially disposable or compromised domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript is the primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ufnk.fr/app/webroot/files/file/30552335739.pdf In PDF document text
    • http://starinviter.com/ckimagefiles/dimuzepave.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/61568006458.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/56157441048.pdfIn PDF document text
    • http://redactron.com/userfiles/file/43373574223.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/71077796320.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/84439957918.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/8436949362.pdfIn PDF document text
    • http://dzbnf.com/upload/file///pimusevirekozifadu.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/99363172363.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/50d193c09fe3121c66e7f546c70d7566/zazuzuzo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d9f12bc1---fokolukevenudebibotasafe.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/razuzo.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/jarokepexupazeguxadalipej.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/42435177107.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160928f95e562f---jufaxutozofewimeminig.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/76719734893.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/veutvffl8ad2objkenhe10grou/80018929501.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/967aec1debcc1efdd4db4e023f40a3cf/44830165799.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc1aef3593---76112056922.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160940a5c4a141---ketavuvadi.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/sowamedap.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1e55602a---sotejaju.pdfIn PDF document text
    • https://renault-service.com/userfiles/fepepomusajidewobunopa.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fd115d9c6---nijas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cross+elasticity+of+complementary+goodsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 11108 bytes
SHA-256: 998090df1f856516b35ea461c68588e16385700ef1f13990d2d8ee726004a17e
font_01_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 21360 bytes
SHA-256: 0ca104447aa9dfbeb008374eeb17330f70e5ea0030b0562dfd3ebfadb8300c9c
font_02_sfnt_off00012d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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