Malicious PDF — malware analysis report

Static analysis result for SHA-256 c910305b6ea5ac93…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 18:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3a190fad73afc2ea4823ae94f52f5b1f SHA-1: e9cf3dd435d75386d424fda013e4dc8d2f090abd SHA-256: c910305b6ea5ac93f83d40001ee56420899a48b525ff15a6258439d7360e8de2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://dioceseofniranam.org/userfiles/file/17171366737.pdf In PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364a2d767c5---58302511667.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/futoje.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/5f6f6869f0770afea2306f50a40c114d/xepofuzekelobikoxikanob.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/vunejakofu.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/zanugexa.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/68pvs98653jfoji8miinodp036/12208178614.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613853d4c6821---13129192658.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/40020395233.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/25450616887.pdfIn PDF document text
    • http://kunbot.com/upload/files/milifefevakebatatawofivuk.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901224707_g6g45b.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/misaviwe.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/siwix.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/21618491033.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/wajigajixonu.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109152147013876.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/bipoxar.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/43033148206.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/34441500203.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/38944287743.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/36136805124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=photofox+pro+apkPDF 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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 10108 bytes
SHA-256: ca317bd8107413fee12da1ffa65fe7547977bc0d5eb821b76d4e756f73c855e6
font_01_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 18516 bytes
SHA-256: 0422c6cd77b021e9b866803f8fa4ff90b4ecd7562a5adcc92f91b27e065d3713
font_02_sfnt_off000123ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1