Malicious PDF — malware analysis report

Static analysis result for SHA-256 13116813b218e261…

MALICIOUS

PDF

55.8 KB Created: 2021-09-01 18:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e2f247a451bb7f7893ff32702b8aaaa7 SHA-1: 33ea0cf2bf99f01ec1a0b2a40cebba0ec85824cc SHA-256: 13116813b218e26133acb00c43c13df2027f67edcc2367b6dfd5d4379fc42b97
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 external sites, some hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware distribution, leveraging the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8412

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://infrive.ru/uplcv?utm_term=determination+of+the+solubility+product+constant+for+a+sparingly+soluble+salt PDF link annotation
    • https://maxflowfans.com/userfiles/file/7861921125.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/visifinupurukigunarijuni.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/siwuvinafug.pdfIn PDF document text
    • http://texmet.pl/userimages/file/31316231400.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/14271987622.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4e66f9ee5a957f97746120976ba9e8df/dilowivemog.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeb28bf439---pisowev.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/82639698289.pdfIn PDF document text
    • http://gestmase.com/media/images/file/luzuwurelifijuretiledegik.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/42483255877.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/7368150931.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2f6c1abe---vulovibefadivanazel.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb86931e91---getumidigi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607de7682d722---makebusugibuwusiwuzajadaf.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/vijamexomenusud.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/kolidimixef.pdfIn PDF document text
    • http://shamayachts.com/upload/file/24896183402.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4dd5f673---bidabifazotarosuganakivu.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/bekasoruvubojas.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/77683502141.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38de983f2c---66343146608.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c40b5116e---84718552631.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/36671003636.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/wuwob.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///41284965834.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/54969687174.pdfIn PDF document text

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