Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf87bd07899cf6b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 01:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e96a1b1f001dc3d2a4560ec5b61cc6b0 SHA-1: cf9c2cbeca384a189180dd9311a5658fa29cc68d SHA-256: 9cf87bd07899cf6b918041e07fe9a769c2fa3cdcc34a61522ffa1970c5d40ad9
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a secondary payload or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bupape.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3fc467615bafe6a24b6c9d7fabb7c820/jonesufelodosafone.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/44527953328.pdfIn PDF document text
    • http://epmachine.ru/d/files/biregexezobimeli.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/webefiwupafodapasaseko.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/36368575056.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/fijedilikojokexav.pdfIn PDF document text
    • http://snft.ro/media/file/finonekinifafegota.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/fafubojapugom.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/82652953816.pdfIn PDF document text
    • http://plise.org/userfiles/file/76401635217.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304d3070781---nefinoxonutelimeka.pdfIn PDF document text
    • http://precisao.org/files/files/kafenupimufaposabiseni.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/82244278039.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/23027235184.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/regigitojakepit.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/tulitaxukaxejekin.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d2a931f2---35457655456.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/17625928482.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/zomajazufupirixuxexu.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/34521609453.pdfIn PDF document text
    • http://lex.tj/img/file/laleromajusuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=rootless+pixel+launcher+apkPDF 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_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 17848 bytes
SHA-256: 7e075016d52f7c5a0509efc5aad85a8d15ac8f66856cf7f14ed1ed1d33e0ca4c
font_01_sfnt_off000100f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 10812 bytes
SHA-256: 2346484a354d471aa2beaf858799aafd9b5195781f6baee06e5abff60fc69684
font_02_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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