Malicious PDF — malware analysis report

Static analysis result for SHA-256 160df91e5667c46d…

MALICIOUS

PDF

97.4 KB Created: 2021-08-09 11:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54d1e23568b6043deacc55d90d4dce03 SHA-1: d59a4bf8d925e8046cf22d8ca6f8d39161ed7d1e SHA-256: 160df91e5667c46dd4571aac408b92318c0cc4fe2203361dcd3a9cee4fae7936
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The file's structure and URL patterns are consistent with techniques used to manipulate search engine results or lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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
  • 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://duhochmis.com/files/uploaded/files/80335603444.pdf In PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/hm5956ut60c864f32b22d2biju/93631709209.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/reripolopika.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/buvenim.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160719deed4a97---raloxudobekomajadefutoz.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/guzitoxabejasa.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ba04627fe65bdb5065b50a9f28da58f8/78849423502.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607193d9671dc---64656929822.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/282115e4d4ae7a354766b0625d196bd8/kajironugog.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cf24fc17e01fd8124ddd5936c06072c6/xiniz.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/63030116094.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a8457bed4963c70337da79a59e7d605a/xuwozojizuzuraw.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/38145581353.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/begizesogepazasifobi.pdfIn PDF document text
    • http://dfanchem.com/upload/files/doxalujolutofufavewarava.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/62eaa03db2d55f53cfdd7a4993c5e425/zisapenevupenonep.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa1c1ebb04---22180543801.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609422ebe5455---66837782452.pdfIn PDF document text
    • http://santabruna.cl/upload/file/musedob.pdfIn PDF document text
    • http://dr-temt.ru/images/file/87402684972.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/mowopewegulas.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160fade0e8ea4c---pirepogezasozuzezefu.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/lulomevupikaferizotek.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/92243260034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=conceptual+framework+and+accounting+standards+valix+2019+pdfPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/57146247930.pdfIn PDF document text
    • 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_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 11900 bytes
SHA-256: d55294f1fc88ebc1d2c995516128577d7616ea3f728c101e68a3e9472fb5a3ff
font_01_sfnt_off00012d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 19128 bytes
SHA-256: c993b4beb1d547f48c75f82f5f67f4ccef05cf155f5a8808ba7c48b9a080b668
font_02_sfnt_off00015f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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