Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d31cc1e7a273090…

MALICIOUS

PDF

89.2 KB Created: 2021-09-16 22:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb11ff5700bcf475c9ce24b9a9dcf8e3 SHA-1: 6b09ca517c1a3013376597eb35c821bcc1cf4b6f SHA-256: 5d31cc1e7a273090631197d484f45b2e7bd3b3c10401231124a73b4b03046f74
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple websites, some of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded URLs suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://etalentlink.com/uploadfile/file///2021090412290848.pdf
    • http://poddertradingandindustries.com/userfiles/file/85314853849.pdf
    • http://akgwealthplanner.com/crm/files/70042732575.pdf
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/55893028284.pdf
    • http://ipayon.com/root/FCKeditor/file/88384854203.pdf
    • http://statsale.com/data/upload/ck/files/jijubagunexutodekapugibu.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137747f5f32f---18810860633.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143922997be9---88060790763.pdf
    • http://nesemlak.com/test/images/uploads/files/71274787980.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/295545af4fbc9b6158a5b61bde4a44df/20780283785.pdf
    • http://becucci.it/userfiles/files/totuposoputikatakakuv.pdf
    • http://xprchemical.com/upload/files/2367755540.pdf
    • https://limadelimon.com/images/file/75273669691.pdf
    • http://mytrangroup.com/uploads/userfiles/file/vokel.pdf
    • http://marinapogon.pl/upload/file/64591866267.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/rudisasewurajoniz.pdf
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/nudoboxorenefob.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/tulakave.pdf
    • https://etadelloro.it/images/file/gomimemajafujefegew.pdf
    • http://phantasos.org/userfiles/file/gotibewom.pdf
    • http://irinaburmistrova.ru/files/91807194798.pdf
    • http://kaies.cn/upfiles/file/bilapiwamakubom.pdf
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50841333290.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=latest+romantic+movies+2020+full+movie+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf72.bin
dca889ef0ec221c541c3756788d2b4a282e4867d333d556ed7a4779e48b5458a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF72 11148 bytes
font_01_sfnt_off0000e964.bin
071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 16132 bytes
font_02_sfnt_off0000fed2.bin
ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 1820 bytes
font_03_sfnt_off00010758.bin
86cfd2ed42e1b14f706a2eca59aa9fb2c280520a73f25a609fe379817cbc4005
pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 21716 bytes
font_04_sfnt_off00013deb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEB 16792 bytes