Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefb9bdcdb6dd913…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 19:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca19207670aea0c2e90b8f1c55a38231 SHA-1: a31c732209c74a465394364c3f2d5c1ea4d7ef4a SHA-256: cefb9bdcdb6dd9139fe3802111c6b3c5bd0ccda3d59334bb6f8a62ff892d2ba3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites for phishing or malware delivery. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://droprint.my/home/ququ4923/public_html/userfiles/file/banibezafuzawarojanupuju.pdf
    • http://mitra.su/uploads/ckeditor/files/gobidatumiruvumigefixu.pdf
    • https://pioneerlift.com/upfiles/editor/files/lezarosemowuvivamesenu.pdf
    • http://alphasigmaoverseas.com/userfiles/file/52709966418.pdf
    • http://deurenhanger.nl/userfiles/file/gesodenuwagapaxebeliro.pdf
    • https://aawyx.com/sites/default/imageuser/file/digejetavafavibexurop.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/7rpecvo04ssbj97i6207qc4h61/godegiwitu.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f46337474---31278532355.pdf
    • http://tootingtaxi.com/survey/userfiles/files/60646203622.pdf
    • http://tfh-filter.hu/_user/file/nesababubokorogarofowo.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/b2a39d9fbdf1601574967104aa4abe8d/61298583298.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b958295777fc8eca5a896587d318ce3a/34981438728.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/86f01575660a00a2d5ff7694f68de0b6/megulejiges.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/49dbd46525d263e90c0a62b8756dab25/69213549978.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/9c21091b595579251b2b8f4b01fa17b5/82024087014.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabaae39ef5---74767256328.pdf
    • http://fvhs1970.com/clients/876770/File/rilese.pdf
    • http://dekoblickfang.de/userfiles/file/43020325650.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a735e1471e7---lakufudufopiro.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/wuxafu.pdf
    • https://ludifrance.fr/userfiles/file/75709366050.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160706ba44ecd3---radotewokamisiwenirori.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/abadece1862e54f320bf5e6574bbe2a0/lubanizimuninutuliluke.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/405308bd5002ab816707e823aec97dab/35965519265.pdf
    • https://isabellepieman.com/userfiles/file/timowulawopixezawifoxir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nathan+radley+quotes
    • 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_off0000f3ac.bin
0eb525e1d73a8295ebd51e0cdce0390aa9848e52fce1b85a03db2d0bde4ea21a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 10592 bytes
font_01_sfnt_off00010b9e.bin
b874e350cd869187a360af7680edbc6a941cb5b39cf0832639b73586530cbb93
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9E 16764 bytes
font_02_sfnt_off000136d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 16792 bytes