Malicious PDF — malware analysis report

Static analysis result for SHA-256 5867c1f56c2d8450…

MALICIOUS

PDF

75.6 KB Created: 2021-09-01 13:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b085b6a6017066ecf851f0dd7cf05690 SHA-1: 73e62e47cc13cfe644a292b0d06d3cf4e283644b SHA-256: 5867c1f56c2d84500658cb3dea56bbbe897ebc8d23e446e37086169228677e3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing trojan. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious payloads. The PDF structure and embedded URLs suggest an attempt to disguise malicious links as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://eldorautomaticgates.com/UserFiles/file/sufenojes.pdf In PDF document text
    • http://desagresbrts.com/clients/34568/File/17924203529.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/78919944162.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/70178661769.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161009e77e5a5c---36136034747.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/10655616055.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25cd583e5b---33944572207.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/45255298449.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ca44b506---11624283889.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/dutejikabopemagoxakapula.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/73881273735.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/vavagi.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/m5hn3oimdhl7lsdesh0jl0pbha/89631794221.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a32fb9eba---lajiwova.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/47724107913.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/87303877853.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/23684290165.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3e37467b8e280e08a9996b1e191725a6/18480393381.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/soxezetuzute.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f67331906ac34d7ebf0e6e45b51c7f0f/dinozujanimupazosubuton.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/gosapotinivokaxidisizus.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160dbef8c9e9e6---bewulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+a+rubber+band+gunPDF 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_off0000c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 10696 bytes
SHA-256: 10fb9eb0cf0c4c04228777125c880593c6dd1471ff1a48bcd1b54cf3d93eebfd
font_02_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 17224 bytes
SHA-256: 6c16022fad0fbe9c74a0d8b7c7100c8818a178746f59219ae8008c082446b802