Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa034a2fb3c77a3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 12:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c08f39c4612ba1ad94b1714672815ce2 SHA-1: d6f5a569bdd784d174c80fe1cd348ccea1454ba4 SHA-256: 9fa034a2fb3c77a3ba4ca3fb96019278d2f7e65e2ad92c252892563f27ad14c3
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 flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161196cd7e11d2---dobevofokuwe.pdf In PDF document text
    • http://bukhatirhomes.com/userfiles/file/49148342710.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/dovozajoxudakotoxosa.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b330bb8c4---2735694421.pdfIn PDF document text
    • http://temple.mo/userfiles/file/sabej.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/85534927712.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/19092646010.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/20828206395.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/odcfcmhodfahank40khpbru2t7/236751721.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/11340107019.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/wunopuberenezusefobuv.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/zurisebovifesabojekodo.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/13983653332.pdfIn PDF document text
    • https://unosms.us/userfiles/file/69517584092.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/36071939935.pdfIn PDF document text
    • http://prestopc.it/upload/file/nugow.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/jj0cncd2im2klqaphg7ltldkcs/54848467738.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/447838463724803450feeb04769feb35/95110590687.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/goponomojefiperodabe.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ced77691f---zuxepovabep.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3aadc1fd0e---kisupipetonorewed.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160729c2e4e154---jedudenowilafasiwa.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/33877764279.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/16591707980.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/fiwuxuzumitu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/45b9ece272f88b0a638b393bbfe8d57a/lubifalegewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=social+injustice+theoryPDF 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_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 17172 bytes
SHA-256: f191b99534875a4b2ed6e809c67e8e5e835fb3ef1bfca9f198535063b11a5fae
font_01_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 10744 bytes
SHA-256: e76c202f22af6a0f05777f2f7b76903e9f6c46e7fe6663f7e5239c9621ab9bb4
font_02_sfnt_off00011dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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