Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f85cd2c2948869f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 13:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 991760138110fb311449e23a6cce8dd3 SHA-1: d54faebfdcb081e08db800fd484402bfca529ac1 SHA-256: 7f85cd2c2948869f03b8dbae0521f3eb59d8a23f0e7d8063b69dc688b81e3105
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified the PDF as a link farm, with multiple URLs pointing to potentially compromised domains or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' in one URL further supports a phishing or SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=aplikasi+live+streaming+apk PDF link annotation
    • http://theorientgarden.iorderfoods.com/uploads/files/56227569971.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/dujojotapipisemifixemegop.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/62305395536.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/dovedexobedig.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/24293119350.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/vogajewu.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/zolemimutusidobubokeg.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/gozigabik.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613104d577c93---naxim.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/zadonasilodumutapifonunap.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/bavezepusekopa.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/005cc6cf1b7fc7d1d8fd1dc05532d0a6/97281804250.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/mapixiziked.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/pubebe.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613302889c1db---toxopamuzujet.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/vovuxajulunawimikilisat.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/sepujoxixogux.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9549c9a5---11662724332.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/68319977219.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/292098029.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/zisuvox.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8e138533---vexixi.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/joponofemiribawana.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///37089924101.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/21333951628.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_off0000c64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 16936 bytes
SHA-256: ac0d5e18422c7f63ab4d699f4464f17f9eb2e4f99b278579a954977420547819
font_02_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 10616 bytes
SHA-256: b452dfc5911a79989debdafb799cfcab7e3b8adf2ad55330b0085bde6858b1f3

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