Malicious PDF — malware analysis report

Static analysis result for SHA-256 36708e65c28bc370…

MALICIOUS

PDF

77.9 KB Created: 2021-09-24 16:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b22c5330ad12f60810ee5b4c46167ac6 SHA-1: 31830a538a620b518213620435f3c744ae432d8f SHA-256: 36708e65c28bc3700bce3f90575df5e53faef65d28e2388da4ed4e165651653f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting the document is designed to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://highspiritsmusic.com/ckfinder/userfiles/files/numokuke.pdf In PDF document text
    • http://brmxn.com/userfiles/file/20210919023043_bjmrbd.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/69055982604.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307b0208491---39879974989.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/gilemepimedina.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1632327520.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/47352290614.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/22688020960.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/73734702336.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1639605999613d54829ccc3.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/kepapare.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/70211984988.pdfIn PDF document text
    • http://koddous.com/userfiles/file/xejitufigawogerurad.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6c37a13b---domegolirazorukupona.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/87798718101.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/20198067711.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/dojatejefeb.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/zivevanerugujo.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/36480164477.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142e960e5fb6---jaziwenefofejatexunaj.pdfIn PDF document text
    • https://grouptm2.com/contents/files/96973944751.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/92589503733.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/90924731577.pdfIn PDF document text
    • http://imbirimbir.ru/files/56231897196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pes+2019+mobile+apk+obb+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC395 11136 bytes
SHA-256: 9a0afc364938e19191399e608c2a1f07b1b350f1b8c847cceb3f7a1efb9f8858
font_01_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 19904 bytes
SHA-256: d700c67fc3362f8cc059066bbd413f573cacc75b043875a8d5757d69ca905131
font_02_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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