Malicious PDF — malware analysis report

Static analysis result for SHA-256 667002ed6c2409e4…

MALICIOUS

PDF

89.4 KB Created: 2021-09-15 23:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc5eeafc3d9656f9bf8721dc12371bab SHA-1: a15bb6ae3158fc17e31215aef9fa039e37d67778 SHA-256: 667002ed6c2409e4242c0a6fe0073e569ddc87b09b9412718cd03542c0a8a73a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://gardensyellowcab.com/admin/images/file/17891763564.pdf In PDF document text
    • http://platcometals.com/images/file/pufemesulavemivon.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/14372264195.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/32263771029.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141386d43c75---39036093300.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/89586961848.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/kisip.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b7fc47bf---jasep.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/51046418368.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wakabufav.pdfIn PDF document text
    • https://msiutilities.net/documents/wupelanoxuregidape.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/99259788017.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/xavobutovimesifivaz.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/5846147309.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6ukqrae7knc37m5qlftcm3ru55/70706501560.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210904130459.pdfIn PDF document text
    • https://seerupit.dk/assens/file/81650156860.pdfIn PDF document text
    • http://emannsltd.com/userfiles/satezumawixuzaxukav.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/maresumebodedavi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161328c47104fd---sofivasapizizusakijipun.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/27244654366.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210911134523.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/kadok.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/kajapixubofebuda.pdfIn PDF document text
    • http://standardamulet.com/files/files/vosavari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=satanic+verses+book+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_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 18156 bytes
SHA-256: f33273ca3dc82e13e9cf7c830607ef563b54913e7fe9ec9c9c7d1da417e11d2f
font_02_sfnt_off00013f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F33 10940 bytes
SHA-256: 1e22b5f2888f4e6e17dabf3274ddf1c6182125bf509055de7a888affa361e672