Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc19543be48e62b…

MALICIOUS

PDF

84.1 KB Created: 2021-08-15 17:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a07f4f1d2389d05c72b56933f7e274c6 SHA-1: 6c42da279ce91b9f7fc07c69f44a90e2dcc645cf SHA-256: 5fc19543be48e62ba5b90c52b92154f77f2471ea50e208c27dac592e893570af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3d9a6c53ce29884755d92b5ebf24194d/83097701231.pdf In PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/9680365a0ebc6a8dcb126e269bbbe1dc/gagalodufajoxofi.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/11218682578.pdfIn PDF document text
    • https://majubesar.info/contents//files/88345795277.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16118a00892517---jidurasulipifima.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/33157769845.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/gukonarugapojatazu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af9507222c0---jotasupirenopamizogo.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/98227532333.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/69041919153.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/zuxilazulageziremamil.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/86015540528.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/88c3180011e5449b9264e1e1b573f8e1/9472648235.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kalakulodovizorakavubin.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5dbd8c43---fibegejirasumizemiwawij.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/ledapajivage.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nipomabojewunitezananowu.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/92848351970.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/71818622753.pdfIn PDF document text
    • http://netflor.pl/upload/File/gawemodovad.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/39722543857.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/32329211086.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/54367902601.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/b46ispj1i3tafemdi1gvdh04lu/55191596053.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tesexonabesabex.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/91075042476.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/vikipolapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=free+calligraphy+worksheets+ipad+proPDF 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_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 10956 bytes
SHA-256: 7075e395a946ed4f33a562e7aa0fc3f849d56953f311c22c35fe1398aee4a027
font_02_sfnt_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 18676 bytes
SHA-256: c1e2e46a34413c68afbb6e99dde52052737ca7a50ac16dcd0f40e2f45e1bb9ba

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