Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc0226a14cc5dbc…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 09:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce3c048ce44d53c6c65118c3be76006d SHA-1: fac377da6ca009d3de9e2d65febc5bb520887aea SHA-256: 0dc0226a14cc5dbcb2da555003152e1e7841cfab52465e22b05b7509b61d5fd3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Multiple heuristics indicate the presence of a link farm pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=nihongo+challenge+n5+pdf+download PDF link annotation
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eb951e60a---jodov.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/40368684728.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4q5of9ldofuto48g7ugid9ervd/23613335502.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7a4ec8df3784608c600c75fe1b49d466/muwifevak.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afd12fb5fae---5244774366.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/62821000568.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/13661654798.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/46679689744.pdfIn PDF document text
    • https://dineflon.com//files/25225693530.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/47355442726.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1038f2150---77053810352.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0465dd4a44---2116724938.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfac49e5f0---45903873026.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd5bd13d4---vujiloxerenolar.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc33a91363b---tunidugowazobesukosi.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12151652943.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b3c9bd09afbf72b94da7a1bec72478e3/saremopamafewamin.pdfIn PDF document text
    • http://dnepropress.net/files/file/potabumevufan.pdfIn PDF document text
    • http://koddous.com/userfiles/file/wefarotisoneputesodo.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/97244274191.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc843c1183---dagesox.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/zaviwulazajipoj.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1obt0bvlkjdc47376l8ceaj32p/tofoxixu.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_off0000bd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD50 17720 bytes
SHA-256: 62d8a88db5b803217a84151187ab3f865842555cc86217a4acf610418a08daff
font_01_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 10728 bytes
SHA-256: e6c5bd5763eb6342b291bfc78aee525837b93f3933602e6b4e5ad322cfd5a87d
font_02_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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