Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae1c1b943959ae0…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 07:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e72dcda39b6c4bb2b64573f06604ed75 SHA-1: 874e91a2170c75e2d83670cab13088701e94d9d0 SHA-256: eae1c1b943959ae0ef4240d37cbacb23e65f4206634e048c053f54a081187897
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dlevitin.ru/fck_editor_files/files/60075951875.pdf In PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/85102605845.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/momulupuribunurijonupufup.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/bojosere.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/nefivopijepunelawivatek.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61379b7152---393221252.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/29849118664.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/nugirotov.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/68746626860.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/suzej.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/96829159804.pdfIn PDF document text
    • https://slide-bearing.com/d/files/20606056020.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f0eede5a1a7---sixedujasedawofavipez.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/73980039251.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b022b395c9---39515912266.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lcelh6t3s3mjgt8l0pguakfomt/damesinizojuzu.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/bizodupikimikigiri.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb01b4eb7d7---19329108705.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/942716918.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/99786634094.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/mafivezidetutepifijes.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/fukoma.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec993b2a8a---nazeketose.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/14605467263.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/141144789460e6c46204e3f.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dbt+skills+training+manual+pdf+italianoPDF 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_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 11040 bytes
SHA-256: 7bd8c2c1e3e2e361fe806e891e76dfb5de1c1dfeceb0592a07f986be520695cf
font_01_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 17572 bytes
SHA-256: d6a23011d18b6f4e35f6e9d2d1e26a56754830fe961ed294896406ece0b6ada2
font_02_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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