Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc56ca32bfab1bdd…

MALICIOUS

PDF

86.0 KB Created: 2021-07-16 13:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a61136c845905acb8baec129b9f3c8ae SHA-1: 876d353ff353ca8e1aad7bc5809ef5684aedcba7 SHA-256: fc56ca32bfab1bdd3d17cb36bbba68dbd241aef3e350a035ff9a5aeac9b1fbc1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded URLs are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/c35a5865fe36296a202b7fa111da4923/xureruzufarixalojokez.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803b91b9424---toxig.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/turirumuvobepanudux.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/a54b52b39df95ebdeafb67e880f73333/lanununowodanerizufefajax.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/46532770483.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/55281290624.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160782973b9c7a---nizegiwadu.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c7a826356---43638876326.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53f7f8c55c---43917302935.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/56509772301.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/96993460217.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c14a9ed92---lopegup.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/54846402738.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/77926409553.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479da02c39---kosugitizapisonofop.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab559c686b---77553817733.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1ecea994---zosovexozeda.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2nrlm1uni2auuqcnpk7nmqfnbe/malipevofubuj.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c442fb463b6---46466414404.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/mavug.pdfIn PDF document text
    • https://wonkingchina.com/d/files/lumutoxuma.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/doguzurake.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608383dd184e3---zaregig.pdfIn PDF document text
    • http://iccarrentals.com/files/file/ladowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=state+tax+withheld+1099PDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7cca99763b5ca4f8a23049327c7a6cbf/wofajetusijelowakak.pdfIn PDF document text
    • 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_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 16960 bytes
SHA-256: dfcec6ae683aa4cbc10753c985e0fef959e116d20831a96ece2ea77c65fb11ae
font_01_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 10456 bytes
SHA-256: d27421698c981dc0a36cccf346569892d92cea8cdeacd1b865d6d65357e5bdd6
font_02_sfnt_off0001329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1