Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf3806032c688d8…

MALICIOUS

PDF

95.4 KB Created: 2021-06-14 18:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ae0b14d104e27cfc5d8d839044eae4e5 SHA-1: d01e3ab2deb860564afecdc8eea455bd8c384550 SHA-256: 3cf3806032c688d8b062cc96e12ca296ff910f18ab0dd0c86a0b4803365f3181
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8101

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://garglob.ru/uplcv?utm_term=nms+s+class+exotic+ships PDF link annotation
    • http://www.advokat.com/app/webroot/img/fck/file/68360668081.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec40478e22---kulujinajeledubopa.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/9ub1lsolv6k0183hiqstlcfvrf/73237504766.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/janefilogopopawa.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/39229809874.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67760caf6e---36485091395.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8315e7f732---zevusigimaxuwejewatu.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/96382651221.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/71858245058.pdfIn PDF document text
    • https://immobilgold.com/file/dojafot.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/451cea781a6f1d9114c4afdcde06a6c1/40756709415.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/74985671919.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/pb3ganv66hcr3qie6aqm7rs115/75308940020.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/edaa20784a5b3953bf0b2436b2b88ff6/79554426649.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/37c3fbcb05938536f52010dfb7c480cc/67197105900.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/mufimunipudumutakug.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3c949ca8f7b5835ec477ea9cf1e14a31/29041640111.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15114 5116 bytes
SHA-256: 8293bb394d74cf0240305a0e034c6d5a28b32318c78287701606059f2cbd96ea

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