Malicious PDF — malware analysis report

Static analysis result for SHA-256 8170fde88398ff51…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 01:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 840ef3872edbf2a9c076da11de801609 SHA-1: c736eaad9ccdccc952151c46ef8c65193d65a8ca SHA-256: 8170fde88398ff5109157a330f7953aa0bf074d664c3a39894b9c00df1665ad0
154 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories or disposable hosting. The primary purpose appears to be directing users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6630

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=carta+sobre+el+humanismo+pdf+alianza PDF link annotation
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/mozojiruve.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/88387422705.pdfIn PDF document text
    • https://elektrona.cz/files/file/tujafud.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021062174912_1040137315.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084dde318d8f---mojafofuwor.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/52935796155.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/4862368533.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/40679962821.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8d367f3f5947cf5b9a0fa4c0a35603a6/93630473235.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/mudibuxekapis.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/bofasegomuraxajesagadab.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/setuxulusixopupufeboke.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/2459983877.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/gebuwubogejumefakuvumev.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bcf2ec086---bizubugavezanibizilowokez.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/51b53610ff2f6591b9862ccc4b4cd9c3/85915597554.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/41273211056.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/05792c110f8f97f73d28e8fa7eb77cca/60698548185.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/kamepu.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/bisetolofuguwibijori.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/dd7a8574ff49ae3501433bc787470876/56546313421.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f0e0acc2ddf7302b83dc90ddb0591410/11227117569.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/1951855069.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/fe43c52387546392f0cb96463f948224/12495710254.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160e690be8308b---73792171035.pdfIn PDF document text
    • 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_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 19904 bytes
SHA-256: 9d33c5bb0432375311b1027385ec207b3341922d3967b6a00aa2e0d09033effb