Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d4d9fef382c9fd…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 12:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0755669bdd19f7c9a18d0620040bef71 SHA-1: 45f0eb4379a59f1db9416df89736689f192e1047 SHA-256: f0d4d9fef382c9fd2a3acf143bc0453418818a05dec2a9b5493bde3e463216ed
204 Risk Score

Malware Insights

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

The sample is a PDF that contains embedded JavaScript, likely intended to exploit vulnerabilities or trick the user into executing malicious code. Heuristics indicate a social engineering attack (ClickFix) and a link farm pointing to compromised WordPress uploads, suggesting the PDF is part of a phishing or malware distribution chain. The embedded JavaScript and the nature of the heuristics strongly suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a49ee87ead---netebuwakasomukulojug.pdf In PDF document text
    • https://mama-light.net/business_school/uploads/file/rizezuburi.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/xedop.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/17061108453.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/39d4d4b18a895cdb90f3ffdb69215854/61483202166.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/soxajideduxonoxenujizer.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/50412205447.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/xopapuvibe.pdfIn PDF document text
    • http://tianfonmm.com/d/files/pewapin.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/93623561518.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/37337442975.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161339d230f859---kojidel.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/61722296446.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/45143579953.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/nemajijoru.pdfIn PDF document text
    • https://protrialse.eu/files/files/pukabisaretol.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/vipavata.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/20054993370.pdfIn PDF document text
    • http://alcantara.cz/data/file/82561394342.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/vunuxafusugivasaxozun.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/rimidodosovamevo.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/vojisir.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/72028740212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=usb+drive+is+corrupted+touch+to+fix+androidPDF 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_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 18832 bytes
SHA-256: e2f9ab2108a98abe1d870094d5ec0bead461352973b93dc23fda613d9c2ae618
font_01_sfnt_off0001147a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 11088 bytes
SHA-256: 007ba504af8abc9ba396649535db0754d349be91a30b83bd6435391213e611fc
font_02_sfnt_off00012e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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