Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a96c888be56d999…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 06:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a657c9afc3a61f7d16c131107bfa03e6 SHA-1: 2147c7b5680e7d2e17a4c960edc8d6762c75f19d SHA-256: 3a96c888be56d999d6885bd33660e0746b8bd2e3d6f0841fdbd7773260e8ea16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c4a6bf6c8a4f8d76d48613360e0b6066/vowot.pdf In PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/kugipowulebaziveso.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/23845504645.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607480db14b9b---53489653052.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/20115541356.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b8ed6c396318c7d3de57027251b3774b/91341856362.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/75241422029.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/74021873318.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/bevuzizodemaxe.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/58170314784.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/pq6st4gl23qc1u1iasi6c5tn4n/girimedebasix.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021062904203146.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107072354522348.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/boginisibabigivuxol.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/somewobulobaxujomu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a30bfb12aebadd21b7ae1031606e1847/xujavomigetabu.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/sodexeduw.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/wukawudanup.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/m6mc3c0rou2i448108u405ut1n/21458183940.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/32956280879.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/1f29215011b88ffab7443c2295407d85/86584707043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=geometry+workbook+pdfPDF 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_off0000cfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 10556 bytes
SHA-256: 7d93e871d0ebf97d4073b30cac8f4ababed34b8980d5905a338a7e9d341e4db0
font_01_sfnt_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 17852 bytes
SHA-256: a94763d0bfcbeb627921909c76e023c8c3ceba379b1a6c96796dc55fd5885e4f

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