Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed1ae2718f2ae2f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 11:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 80761430acf3b77e836302e534ea280a SHA-1: ae1d2924c83a524f2ed69d48cb493b27c883d560 SHA-256: 4ed1ae2718f2ae2ff2a46468c09defa01d6dfdbc7ced9f66ec28698fcb34f987
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage vulnerable infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8i97mhpvcdar71imnjqv49io35/lipokanipumokiwemurexi.pdf In PDF document text
    • http://capital96.com/userfiles/file/lureroxutopafatozisalum.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/wopik.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162837978528472503909.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/lrdiah4r46odcmapkkaq7hc2d6/48192820072.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/kukonejitezibojatagax.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/9e4e00bae7d262ca923310fb2229a9a7/48742266301.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9181e309ca1b9c9cb8ea3d4aa7e799ff/9252179699.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210815185008.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/wonibujupume.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/16974426038.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/tepatofirufurudobude.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1403f207---dekalagukunimumalogegu.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/29651983642.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6ee0bfbfb---57756237814.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d68740d10e---xovotawolevogivugejawifi.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/43728812878.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/barovunotumuvowowima.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/3747270483.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c8ae86ef000cf335ac9490a131badc53/tezuketebuferotidakek.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/dilapavagewutozililaxe.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/gedoxetugajogoxurigadide.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/nadoxuzofujuziv.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c270016cc6e---80664043743.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210617100905_m6xdki.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372105d1239---74771606480.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad5972a6bb---zunanirorapigonilufefas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=impacts+of+devolution+in+kenya+pdfPDF 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_off0000bf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF17 17044 bytes
SHA-256: 4f19c94c2cdb672d2c5d1515fb9c546e39141365452b0e7eb6f722c0287bcf4a
font_01_sfnt_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 11004 bytes
SHA-256: 0f04fd047f7ca4e19cacf163c5346a7cffd29a35afdf3b915c8f6cdc46626514
font_02_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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