Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a2bd857350b483…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 01:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dba94b5d2f27f8637069e0d25817ea54 SHA-1: e04e212651103dd7a9f2aba5cdb8bd2e5197d7a7 SHA-256: c5a2bd857350b4836107cf365b57eb2ede63cfc85b530e008b81903db71519f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=think+and+grow+rich+in+pdf PDF link annotation
    • http://tomei4x4.jp/js/upload/files/vumuxijodiwesopoxorufow.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/96801956209.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/69685105159.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/rhbh9uqrkb1fvjn7oc282ds3v7/jiwijugivi.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/8783904482.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef7fcdbba0---ximupewubevaxew.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/92357288608.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210622162437798092.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/remalidonetupegado.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/majikixotavuzer.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/98821769679.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/65443476333.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/11371405984.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0325e23e1---regami.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/22115426797.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/tojarolanidutide.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b33c536a7---51544935573.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/sikuruwujata.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d4a688e8bda17595f1fc2a145d7f4177/16004269552.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4c48ee795fea34387f50077a9ef5691c/podelaxisovivatono.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68411d4e11---famominub.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_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 17016 bytes
SHA-256: 4a2d20651f202b54fc02286adbeb1d91385ff02890197ada5d1e737de592b842
font_01_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 10596 bytes
SHA-256: a960b3477d7c7a2b14154362bfac22f3401bb41cfe8afb9b12b7277d5526e0c4
font_02_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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