Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d91ee1ee0dc11e…

MALICIOUS

PDF

94.2 KB Created: 2021-07-22 18:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13802b59910faca791881eedcc5982a3 SHA-1: d31760d650382b0859a99dec170383af1235f010 SHA-256: b9d91ee1ee0dc11e6e1f9bdd880f2f6fd18cf25a246aea4a2f35268786310a76
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially track user engagement.

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://beautybybelief.com/admin/images/file/23598580870.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/30568808.pdf
    • http://doktor-okonski.pl/uploadimg/file/dizekiradiv.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b635108312b---tigesibim.pdf
    • https://cplastik.cz/data/cms/file/wekebedopukuroxigosovefen.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3vsl18c8tt929dvokb2ia17q57/16249975384.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf4ee4124---5189813821.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaa57710c---mugotofamuzi.pdf
    • http://museodegliarazzimarsala.com/userfiles/files/ziwapaviserus.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f94e77a4---57375134276.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/uruis9qpp92bvh4jtvf0smj57p/xekusobi.pdf
    • http://tort-art.ru/userfiles/file/24219330660.pdf
    • http://hainescentreasia.com/images/file/48157420818.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f88f29bbc46---xoleledupinutotodaxo.pdf
    • http://helloslow.com/data/userfiles/files/bazetovopilutarozukis.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098c23e0ca1d---zamubufawam.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/d90999b72814a0b6098a8b3a87471575/duzimo.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ef66003c5a26e46642ad94574b4d0bf5/junozirawe.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/59c0de34b9a024979598501f93253bdc/16441220781.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/lukesulekodapobibovisug.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c1e0b61e3a4190f44464476edf3d3c2a/19497789798.pdf
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/xipatememutin.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/29563690816.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a39f86858f---64009765664.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e46a0f49b---zaperirifilenojanefupivas.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb026a85da4---wotexokunuv.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080df81e25d1---xojabalabajokiwus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=tears+of+gold+america%27s+got+talent
    • 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_off00010bf6.bin
9ed2c080cf58f6a8535133395da2272f8b9e2df0758d0a16b52419d8a96b5bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 10816 bytes
font_01_sfnt_off000124b9.bin
0fc51e3ab198c3a74bb468d1f3fb3645a427abfaa0563b0da8cfaab6bcf4372b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124B9 17552 bytes
font_02_sfnt_off00015292.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15292 16792 bytes

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