Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95cb433d37e5f45…

MALICIOUS

PDF

94.4 KB Created: 2021-07-22 20:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1cab7a67a1330b87ab67ce006e0d75bb SHA-1: 3bbf1b9444019e972b04562824c32555208235a1 SHA-256: c95cb433d37e5f45875824e7fac03f836355bfed947ddc244ee3ea36635acc1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to lure users to external sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://master.plus/wp-content/plugins/super-forms/uploads/php/files/61795fcf558f1893858b50ad5ef8b803/wexez.pdf In PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210620_6BF1ABD9AA7B9A50.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81d18daf9---momowagirofuwun.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/bfn2pfhpopd02ppjcro2s66jok/rimudamobozimabawiv.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f48245f2---fatunopetirakejidokukoja.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e6d31e03d---bodumanewozipifeko.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/99962910087.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3632b58afd---bukofurufesef.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/nokutafiwe.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///poxuw.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/jipojew.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/46842904023.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed303ebd2b---7518290497.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ad61fb99f4358f1f9e797ea9ebb0b6ed/jirekosenapugifa.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c27d1c0db9c---noxoximuzixubusilopej.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/dazimadojowanimupa.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/69339768124.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/joxojug.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/58457818035.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9279688537.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/kudabilotoguko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=1+dollar+to+randPDF 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_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 17300 bytes
SHA-256: 6b10c4c91e67f8187663d2a2cea7e30dcede8e10dfab8fe56bb97da255972056
font_01_sfnt_off00013e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001567e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567E 9804 bytes
SHA-256: 59052a9f3fbe84e49109bf84d496fbcb3c33a102022cc6b2f36b4c14a9254e4a

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