Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf420c02f4766320…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 09:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec67fe008cb7f0d74839e82fca29bc12 SHA-1: e50ab766192d2d06d8e310cb242d8b802e3bda5b SHA-256: cf420c02f4766320f4ebe3e5662493f7130b1df670b3d71c643d3648a74f8193
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://kaitosushisb.com/uploads/files/86972021701.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db5ddf9cc9f---68015191432.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/nagepewiw.pdfIn PDF document text
    • http://tms-operation.com/upload/files/60078813346.pdfIn PDF document text
    • http://centromp.it/userfiles/files/xadejasi.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c2b875adb93495203b9efa8bc22becbb/fenevoj.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/nogavedaxetumulaxaze.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/57017385189.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/21843298549.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/5299337938f365212eddbc7fb9cfafde/33033119228.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/59481663408.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/14571790394.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/56683888120.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/31896096733.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5a20c3af7---pewigeputo.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/a154ksq4numkgddf33olvaujgu/mivamutanafileb.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061319551611.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bef8278d7b---568369503.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/kobekobuxezirosoxoresuzu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607bbc47d4939---89639690310.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/212a7c76ebac1a0f313d4206b740a500/9111243725.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ae6a05917---93456146518.pdfIn PDF document text
    • http://liyangah.com/Upload/file/dogazuxoxodefakikugugavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=apexi+power+fc+commander+manualPDF 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_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 10784 bytes
SHA-256: 45eb3f3e3d1f4f49ab141d970e40a0ce990a1108e350051dff1aeafa5ca80adc
font_01_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 18284 bytes
SHA-256: bba7c2359c487ed1867b6a04619ebadaba7d344c7344dd19d070b37482ffd6dc
font_02_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1