Malicious PDF — malware analysis report

Static analysis result for SHA-256 4203e6cea17c4284…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 05:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e662f3d239005307eaf86f4777405390 SHA-1: db4cf67a2b8cb80631a72a4713905d07e5147514 SHA-256: 4203e6cea17c4284528dd3cad8d97591c3246fe23f6c4f32c797b46f9733f8d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to download further content from compromised WordPress sites, and presents a deceptive download button. No scripts were extracted, but the presence of numerous links to potentially malicious PDF files suggests an attempt to trick users into downloading and executing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9pg61qak88ljl6imnm6kscnmi6/93244528243.pdf In PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607105093a3bd---13815238666.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/68341153115.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/klhintddrc2e39mk0ml9difhc7/56749229213.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f671644c93---42131242223.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/38292735835.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/96489101024.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/7095696542.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/23f9b8d2e85bd17e765463c76a5739b1/35877874983.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5fb886dcd---vejufimavuka.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7782e351d---tilisusomorexobanunatu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbbcf1ed1a---tekaxozoxupojidalilane.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/42390eb2b8085ebc625440c2b0b81cd6/41521115959.pdfIn PDF document text
    • http://saaretravel.ee/images/file/57909594052.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4t2klr9vqt8a9mitqhv6evec2e/rosutawinadezalowaz.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c94ea61f8e---toduduni.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d01378a677d---boxikogizebif.pdfIn PDF document text
    • https://yuss.it/file/wisanutotowu.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/48031142495.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wamututofaseforos.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/tukezimunotuwotepa.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae89b9e9e---33445360811.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/227c3b3adc0127b6fdef1b8c74e3635b/zeromuzakox.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/83291461076.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/3f53f4e534d0ce5ae1a553645b86c0e7/jadufulamanomasolunaz.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/siratev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=common+and+proper+nouns+worksheet+for+5th+gradePDF 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_off0000c909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 17212 bytes
SHA-256: 0f9b63c91e1d69919d3a0faf0d6a55c0d2f9d1771cf6ad212daadf04107734de
font_02_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 11252 bytes
SHA-256: 0d1fa4570afae7d448eac0efd0c195d23ce135ab89ce6446897d912a62325acf

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