Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e566295b061c4c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 07:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb26b5ae17432bda6c01390c01cede92 SHA-1: e450713c9c2765379c1e5a66837ea0281a7a52fa SHA-256: e2e566295b061c4cd9b7ff7a73f417f964cf173c7ea455090042ed4c7b9d0866
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 disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link aggregation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medi-sen.com/files/files/26784489477.pdf In PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/kumiboforened.pdfIn PDF document text
    • http://boki.hu/editor_up/180150237.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/faravazidewusulev.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/pokidituwatuxirisam.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/revuxetapejakupiteni.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb828ef4d2---kadafepil.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bef4bbb5e---xikilivejubibilen.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/puzakebanuf.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fa3bcfe3683---63787683370.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/84547071959.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/konifeguna.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc1de479a---fexopopoderodidaligapawig.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/dedur.pdfIn PDF document text
    • http://dentherapia.hu/files/file/35683791867.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/1959020912.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/khla1qf4gn6mnt2gl28jc57t69/powumubuj.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160713b1b8f15e---99723246251.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dogefusarelem.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/rivotobuladi.pdfIn PDF document text
    • https://parc-hotel.info/file/sakerotiposolabigakovuvir.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/nusadoruzumix.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/retupabunedu.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/95847060258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=all+state+cm+and+governor+list+pdf+2019PDF 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_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 11472 bytes
SHA-256: 4caa2e3c53c27e7e412640632d138f1466e11b978c5d30dcd15b84db888c4cd9
font_01_sfnt_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 17112 bytes
SHA-256: f9df4968126cf9ff7035797cb8df1e987b98811a3f63bc4fb6576ba5c30ccfb3
font_02_sfnt_off000110f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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