Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc9355a36561830…

MALICIOUS

PDF

95.5 KB Created: 2021-09-02 07:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 058edbf71aa2de662f350af9159cebef SHA-1: 8313331ff9463049c361677d1aec726bd525bec6 SHA-256: 5bc9355a36561830a5a0bf3d41a85a296494187ca554c3ab57c574097dddf885
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely facilitates the redirection to external URLs, which are part of a link farm hosted on various domains, some of which appear to be compromised WordPress installations. This suggests an attack pattern aimed at luring users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=introduction+to+argumentative+essay+example PDF link annotation
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e1a60737d2b5816d66a138d4412d0d5b/setel.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/21743089859.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/jevemigilu.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/juvijoredepowusekumoba.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/53523335618.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/digibovajeridenoze.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/65233434208.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/86980788695.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/xogapudedu.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/65389704412.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/28136185865.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e57c47926969ec5d1bddc79a55301ae3/84806911390.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7a633c24---21200839882.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/36853844618.pdfIn PDF document text
    • http://mid-europe-ex.com/tawopo.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/79374257540.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19881726586.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/43942131519.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b351d88a4ffd1d181b0658ce3f2ae506/86892677506.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/logiz.pdfIn PDF document text
    • http://chayka-svg.ru/files/duzepexikowomafapi.pdfIn PDF document text
    • https://ranagro.com/files/19023636381.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b339125af83---rovesaxenenuginigowu.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_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D5 11188 bytes
SHA-256: 1d231f247c759cca6d3dde0a72015ced59c51c0e2220c7e92f137ed4484b153d
font_02_sfnt_off000141d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D7 17368 bytes
SHA-256: d27ac983cb6844851f94b5db684bac3a618144d0780fcff8b8159067c7a5aebb

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