Malicious PDF — malware analysis report

Static analysis result for SHA-256 d981523a399c1660…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 08:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb589f77245ff1654b1cf094e6bbbef8 SHA-1: a12da2d127d40bc0cedb88493f7282e3c2926225 SHA-256: d981523a399c16605981886573303bb02461fb1f81281de0708798fa861f7d6b
164 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating embedded JavaScript and external URI links. The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to these external sites, potentially for downloading further payloads or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://pixomot.ru/uplcv?utm_term=redmi+note+9+12.5+update PDF link annotation
    • http://martonelektro.hu/files/file/zuloxavope.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109150151153798.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/wolozagomugow.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b4972050b72e0fa3ce4c6a9b41df3038/92844015500.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/pevemilutus.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/sitokozoxanopetaz.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303008cf120---minowixixetiposiki.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/xopejaxowipowov.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/xajido.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/83907282983.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210908_B7F113320C5AEBB5.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9445e9e9---76509358527.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/66360863130.pdfIn PDF document text
    • http://ed-union05.ru/files/file/sewudedumofutowilezabi.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/pumomedarisateliweb.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/44704513257.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/bixovak.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/lugabaguvutekuzoduwim.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/67308286821.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/88638151158.pdfIn PDF document text
    • http://envigest.cz/upload/file/65770276832.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/lubovoj.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109161537265642.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/65452848513.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210916063540.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_off0000afce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 10924 bytes
SHA-256: 7813d13d52ff44b9c88c536ba55c11f3c2384c0849a4466c94777b1f829d895a
font_02_sfnt_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 14468 bytes
SHA-256: 630639146f483a5bd263d019d646bbce43095fe26e6cf1ff5da46d2a4762d447

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