Malicious PDF — malware analysis report

Static analysis result for SHA-256 d341e4311000e54d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 08:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59e1aa0101cfa4747666bdbdcb037b96 SHA-1: bd726c721b5e11de2909a4c175c99875c3403816 SHA-256: d341e4311000e54dfb832cfede3a4a868231f9b64bed00b70bd3e5ab24e5d42a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://coretry.ru/uplcv?utm_term=android+smart+view+windows+10
    • http://musicincw.com/fckeditor/userfiles/image/filomovu.pdf
    • http://upsshop.ru/ckfinder/userfiles/files/wugegagajugileregitud.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5ppia2t90sucf648k70nemi6hf/4641360542.pdf
    • https://shian-jin.com/UserFiles/files/60453134617.pdf
    • https://hfbee.tw/upload/ckfinder_temp/files/20210903235615.pdf
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/kifexowewisosiguruw.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f069976cff---13361311075.pdf
    • https://highendteen.com/userfiles/files/8637929353.pdf
    • http://bscartridge.com/pic/vadojomogefuze.pdf
    • https://konteshamamotu.com/userfiles/file/95319076272.pdf
    • http://senvietsystem.com/ckeditor/upload/files/kepukolajenasesarozuzaj.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1a406c236905b0f482a6d32473efaaf7/80298201088.pdf
    • http://x-site.by/upload/editor/files/vunovexodejokux.pdf
    • http://radecznica.pl/userfiles/file/78897934967.pdf
    • http://popmetre.com/news/files/70639174402.pdf
    • http://astprom.ru/sites/default/files/file/84670678010.pdf
    • http://myucpb.com/userfiles/file/rulinimizojuweron.pdf
    • http://michelschuurmans.nl/images/uploads/file/31890438261.pdf
    • http://akwarella.pl/user_uploads/file/nukobibawosova.pdf
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/givem.pdf
    • http://frutapac.com/ckfinder/userfiles/files/85072854242.pdf
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/36859013887.pdf
    • http://ovecollection.com/royal/admin/images/products/file/sevatabefa.pdf
    • https://pro-biomed.com/admin/userfiles/file/27426304091.pdf
    • 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_off0000e818.bin
d76a7227e4a26b6d725354f7b47aee64c355c336d5e02c051fa51a70b305e8eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 18892 bytes
font_01_sfnt_off000118ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 16792 bytes
font_02_sfnt_off000130d1.bin
1f3b4984d1bbe9e308dfa79a8f7f66d921508adf2c1f5ecbf5b9316eb34127b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D1 10668 bytes