Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5068aaed6c11302…

MALICIOUS

PDF

88.3 KB Created: 2021-09-16 02:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49f5bf8914873566ba22efbfc735ae18 SHA-1: 1e4965c3e61dacf0ffa9c62e44efddd14f7ae56c SHA-256: f5068aaed6c11302ccbd66018561a214112e9e62eb7f41cae0c631e81dcf2a86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The PDF likely uses JavaScript to redirect users to malicious external URLs, potentially for phishing or to download further payloads. The presence of numerous external links, many hosted on potentially compromised or disposable domains, strongly suggests a malicious intent to direct users to untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://files.ibiza-ferien.de/file/sozelolitalux.pdf In PDF document text
    • https://ph2020.org/FCKeditor/file/wonunubuzaso.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/tukusiwetofose.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/42581750913.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c923aa42161285429c058d08ad26c542/61838532118.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161354bc4a048c---zewevekop.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/84119605563.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/90756863454.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161387469a5d85---32756309201.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/634a835b1e77d5a465e00c79fed028e2/pezopabawarot.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/lefekivududevo.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/joxepusejomabevonakuf.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/7affc24ac17ec73c582af3dbf73f12b9/73834646930.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/gelotiva.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/23800284974.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/35768813103.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b590fb8691---91327507947.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/3993125474.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614278849899b---gegejojekopasipepen.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/tijiwobuwegeke.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/32671749520.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/84433189384.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///16314396876.pdfIn PDF document text
    • http://fructusartis.com/i/File/fifolunoxapufinenimoko.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/8740021962.pdfIn PDF document text
    • http://xfswchem.com/upload/files/wibuvazuxaxijebimejon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=jak+tworzy%C4%87+gry+na+androidaPDF 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_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 10560 bytes
SHA-256: 65f522a123e58a22ca80867f9a53ab4df149a26b3683629f68a110584187c91b
font_02_sfnt_off000121f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 18772 bytes
SHA-256: bc6673a6bcd05e5cdbd679b1cfe127b37decff7cea111e5c52854d0d78d8212f

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