Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2508e96fd19933…

MALICIOUS

PDF

55.6 KB Created: 2021-09-30 13:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26413b9a97a5f81664f6809de67c3792 SHA-1: 0347798976b94445fc78ebab1c4e971736790996 SHA-256: 2b2508e96fd19933d66fed0a79eec36e79444610f737dbdbf92c659f33261042
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8155

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://lecourbe.dk/userfiles/file/94796144167.pdf In PDF document text
    • http://global-leasing-management.com/uf/file/5290826111.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/52739958162.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/21652191729.pdfIn PDF document text
    • https://bloc-immo.com/images/sebonugug.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161409e8c9a16f---nasuvinuj.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/mefabajotit.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/28619894275.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/87337339985.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/xonosurexu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbeabaed58---1878025119.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1632874661.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152e194f01d2---safavufinotuzujajes.pdfIn PDF document text
    • http://runhouchem.com/upload/files/96028927768.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/dosino.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/78737578807.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/66997025150.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410df0b23f3---wopusuxugolisebenomelefe.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/55570551070.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/25608425290.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/faludu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613841ecc6009---xolifit.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/22156061387.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/7551082873.pdfIn PDF document text
    • http://devveb.net/userfiles/file/89750911140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=document+scanner+premium+apkPDF 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_off0000b6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B3 10684 bytes
SHA-256: 61ca6180c9e5657f4833986b457732dd869e56a6e3386aaeda79306849067ed1

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