Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38698ecdd2d8c86…

MALICIOUS

PDF

86.6 KB Created: 2021-07-24 08:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9a0af70bd4744e625a3c6540b9e7a30b SHA-1: e84edcdfaa53120203dcaca7910e92436e9b7a05 SHA-256: c38698ecdd2d8c86d573e33bdc1c5db5a74556aac37e7eafd7547431371d642f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jan-fotografie.nl/upload/files/54574910335.pdf In PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832bfc67ee3---56198513202.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/35693188123.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/75640683531.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/71257014405.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/aca06b55aacd0ee844c8ae78d483227e/ditojevaketorosok.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/gamobipujotukadifakofamo.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/29331147119.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf54080209---9062144861.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/76324351999.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090aa453a29c---99225636379.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/gujuluxiwuxalud.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2add8a9c6c---87897371057.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/tokukinutixopinat.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/57274730126.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/hh8phjqnuamdsabmsjpb3062ig/80237120749.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/4bf46943d6199bf7f5322b504af7bfdf/99153965719.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/53025163402.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c43110ebce8---xegexagekivajir.pdfIn PDF document text
    • http://seamacros.com/upload/file/42388977771.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd02ec7d7---24989837993.pdfIn PDF document text
    • https://neplatnasmlouva.cz/soubory/nibidinaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+submit+nsfas+application+formPDF 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_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 10828 bytes
SHA-256: 183a34f130dae4e90e99c1a474b2764cf8d00c265de114b567381dd4b3a15ed4
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 18688 bytes
SHA-256: 4cc7d0f51f7f01f0b53e926f6f9aeb2979b93a38eb123e1527f48bc4d0d60fd8

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