Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83e56efa978b7d8…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 06:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe882f02f1cca2c778f9aa3131ae04fc SHA-1: 3d7cf5d0fbb011568b9163eae2ac5e04cbff9d45 SHA-256: b83e56efa978b7d8cd6d993e221fb3265b139f1c3e9ce6852d3f6397205b36a7
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised. The primary purpose seems to be directing users to potentially malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7511

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://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e88cda745a7eb301a8368219166c97f1/zigidiguxudazotuforagiw.pdf In PDF document text
    • https://jotelek.hu/files/file/nozasexiwefuwefabewix.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/68960297079.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/fevojukedokivufig.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/52681815930.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/vigowovevaw.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/josiva.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608483d1d60b9---77964769524.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/61444343517.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78b12562a---49175528334.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9163cd9552279baceffa3256082c0d64/wivowarewemamogufivezopaw.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3ad156957954ad88c2755a9a74b9b517/54757519612.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/futup.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/8368493305.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/20910232339.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/tidogineru.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1491593c18---fewoderanemefaxupolinunu.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/11339366087.pdfIn PDF document text
    • http://easy-vent.nu/userfiles/file/29269207587.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/gezulos.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a1c3b49bb50c0ec638c06968a861a4c6/79982874578.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/xirimato.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/10573674408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=happy+valentines+day+images+for+sistersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 18844 bytes
SHA-256: 02021edbf3a8809ad20ad23124280bebcfe83d1269c9bfb0caa90a11433c3605
font_01_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 11012 bytes
SHA-256: ffc2f78e947bfa9bfb229f3a4a354f4debd63f17da1dd37c0ee1ebb770a6cddc

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