Malicious PDF — malware analysis report

Static analysis result for SHA-256 d716538a91be5bd7…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 01:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19c1b0b8bbfbc8d16a3d0a854d903912 SHA-1: 4dc2d34e2b86248c37a7b97bb1ea39ad36d7009b SHA-256: d716538a91be5bd7fcfecaf93416eefac89031053b496ea108267dbc667945b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://timnhanhonline.com/upload/files/35841566659.pdf In PDF document text
    • http://toyotaprius-custom.com/js/upload/files/tukerosavuzolaweweputa.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/degigapefab.pdfIn PDF document text
    • http://mayjack.com/upload/files/73904020490.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143db4da1854---71984786115.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/xaxaxufa.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/vuseviw.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/puvelete.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/mawiwo.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b3123de8---70638735997.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/20413503501.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/tojexupuzar.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/dosovolu.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/babinerinotis.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/7429705411.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/551780608.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/vigekotewabonejokovanu.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/23839798169.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/51129312841.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/88892340956.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/d4675604ef153ae8ae9f04543db5f144/71201073488.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/tulelinaworoji.pdfIn PDF document text
    • http://envigest.cz/upload/file/39723826026.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/700177b76799f25f769ff44c899c73a1/23317838933.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/37915702750.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/davudebum.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fikebemevodawogorare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=tikfamous+mod+apk+unlimited+starsPDF 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_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10816 bytes
SHA-256: 83625247a4e4663438b7d972ddf0d9b8b7117d154feafbe5bd133eaae1db387d
font_02_sfnt_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 17548 bytes
SHA-256: 8e1b54c020c0eefeefc819c03bccf8a03b02d5a405e1f6a03b365634e7c13e36

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