Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb45ae62404d0be4…

MALICIOUS

PDF

134.5 KB Created: 2021-07-07 16:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e85344181ae948a11aa5c6398507c114 SHA-1: fbba70546663377c74eda8418d6b817b6ae0606c SHA-256: cb45ae62404d0be4937c2c91833089c9883b2329fae77f57ba10249861f96748
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078723a57fdb---11064873219.pdf
    • http://cuboni.com/uploadfile/hong202106092229441173.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac71bf24c---vekeziluwewezazivigafituz.pdf
    • https://fruzsiflame.hu/userfiles/file/9594435866.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/h8pegc58d6bvkuja58rkcir8ao/soxos.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/13435f317e6466d4a2028e8237e24437/veputivonosunezefuwokidu.pdf
    • http://sbox-technology.com/upload/datoteke/22498855552.pdf
    • http://ciccioinpentola.com/userfiles/files/jomikevuwotudegex.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16221464387692.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a536350f28e95831d9b9dc9d35966603/nikuxeg.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cef2ea081---vuwafenadofejureda.pdf
    • http://apcmagon.com/userfiles/4391472170.pdf
    • http://anbao.vn/uploads/userfiles/file/dikina.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d731af0f0c5675285c7bbf7ae7e0c4ea/87712207377.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/96311909736.pdf
    • http://austria-ex.com/images/blog//file/pubakumagapuw.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/c57bvfqomqjiki4o0gl25uqkm1/30879156843.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6fc089651e4dec841eaa88487531db69/87006463925.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c7ab2813d---xibavukokomesegonoj.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dec54996f---muxefal.pdf
    • http://atdawnwelift.com/userfiles/file/muzolemevebameriza.pdf
    • https://motelandratecuci.ro/userfiles/file/27000161438.pdf
    • http://top-conversion.ru/ckfinder/userfiles/files/56358723475.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/24om95qs9bted8cm00a51h88pq/gabopezutisogisi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bloons+td+on+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b00a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B00A 16792 bytes
font_01_sfnt_off0001c81c.bin
ab19053361237ac994a6a8c377d6fd058fbe3aa3e2645c9183af8fd84549d9fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C81C 17144 bytes
font_02_sfnt_off0001f4d9.bin
4b568403cdef4d32ae8d1d0475854ff1942ca6643360e6dfe5b3176110fcec16
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4D9 10072 bytes