Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c763555f4cec150…

MALICIOUS

PDF

98.7 KB Created: 2021-06-27 00:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2b21dc492bbd7bd7e4e4df94a228e6f SHA-1: 3dc1a824eedd71a433a68ef8d7ccd2ae2257257a SHA-256: 1c763555f4cec150a9655efce0fcb038295412d4692bd81ddcfa508f58a0a532
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple external domains, many of which are hosted on compromised CMS upload storage. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6135

Heuristics 5

  • 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
  • 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://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e06f161843e4a40d3ec1515ba14305b9/21346387055.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b93f27adf3da3edfee32958bd71cf77d/pavumovilopuxatibav.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210520221249.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/70737341739.pdfIn PDF document text
    • http://nakatka.com/files/file/78034650163.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/88642560572.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079adcf7eacc---rawemifetefutugetogaxarem.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eedab158b2---levizaxaz.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ada0b0f8---8695680421.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b04032dd5---niravi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16080549a2ab9b---69797839241.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608186ab6e74e---77524349351.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/53100142602.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/89646843777.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/361472ce8521bbc5daa84d2358124286/vowofesoxuleloluveniluru.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/04544d425061e62d2113aaf82c3f5b51/vipezafofojuj.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/jevupipizepakazegininegad.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fe85eff45456cc1e38adda47b3a3578/81395757035.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074668a76412---vewuvikesafuzeval.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca663a4de4e---dibufoganepivu.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/69188172847.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608093a8b5e2d---1221613862.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/64142248252.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///20524167764.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7568c12479---zirixigiwakilababiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sindhu+river+in+mapPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001700a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1700A 10468 bytes
SHA-256: fa9dab4fda0d64aed3a35e5d8a2b35ab2cf9e46e8d2831ae0ccba80ddd4b4516