Malicious PDF — malware analysis report

Static analysis result for SHA-256 c355d40b32e23e5c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 14:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 561b557eddb7b1db0e2bbde4f541d5a2 SHA-1: 809b973f26da59c05d8d4d10b3ec1e8c0dd101db SHA-256: c355d40b32e23e5cb59d62f2a5ea186b82345526a9975525ad81ca898e0e6dc6
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or are part of link farms hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://yujinpharma.com/upload/files/17697428169.pdf In PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413d2f531b2---pujaki.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/kefogiwizo.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/dilif.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/livum.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/tisesivoru.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/361895205a96698020265f5b8b1ab4de/18651701811.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/bisawikujututazatedoniw.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/folevexegenizumuxunipop.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161447cd6d50ff---nuxiz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/140101ca77de1bd1462374310433fad0/zonigidagusuxofotixoz.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/wotitowamabedijifexubeki.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413997b94d6---67564280571.pdfIn PDF document text
    • http://benjapakee.net/UserFiles/File/zajifokezorefeg.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/74783810377.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e0d9bbc37cc04b84f2277c51761bface/pokatajituxodarutawode.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/tevivedojawato.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57776135402.pdfIn PDF document text
    • http://uhorder.com/upload/files/kupikojez.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/32807015630.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/94369095435.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c042e360d1---71264010645.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/lakifubitazepesiwogefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=learn+node+js+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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 10340 bytes
SHA-256: 672c52a61539325b2a8181f59e8d87862c40732e38065377204f81051d686d1c
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 19332 bytes
SHA-256: a8a6496215bd35777b720079d07a0bd6c7a9c717da32c685ca2b46d677687756
font_02_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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