Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9c419a0e2c2dbc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 02:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: adcfd9d8e5754626df9527d363b34baa SHA-1: d3c24ccaf9cc98404ed2e641a6ed657efed5f3ab SHA-256: 4b9c419a0e2c2dbc7dbd802ef5cbea4b2f88ed5e83932e2fa0afba974e32bd8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://wastran.ru/uplcv?utm_term=sad+but+true+lines PDF link annotation
    • https://promise-land.com/upload/file/kujakegirakokawunemozu.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/sakuselexosirebig.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/mozebazatoxomi.pdfIn PDF document text
    • http://zzquansu.cn/d/files/libejife.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/37915290491.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140370a9a3d2---zodurezikeka.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/66037565255.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/11714690667.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/novuf.pdfIn PDF document text
    • http://js-space.de/userfiles/file/gezulatalopoziditen.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139542f468c3---tusalol.pdfIn PDF document text
    • http://sfinance.mn/userfiles/files/88889324383.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/28361841372.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/36087487603.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25227150354.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/69265036770.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/76839648721.pdfIn PDF document text
    • http://yongqingtech.com/d/files/furimezamapenedija.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4934bafc6---jegeruta.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/07da6c2357dff228ebc2b3083ed48218/33028664870.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/wazusoganoxejapamuze.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9749686e9347d77aa8474cf1827a918a/xakewudajagefe.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/25362107028.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_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 18524 bytes
SHA-256: 82a81656b99f8921b186b937d23024bbcd2b7c2dd5b305a272057e76cbd27c06
font_01_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 10436 bytes
SHA-256: ed9952c493dba00c3f351fa2adb5459d9240fd81b5d3f6d95da80b93c88e83ab
font_02_sfnt_off0001202d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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