Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b07170efe81a9a…

MALICIOUS

PDF

84.0 KB Created: 2021-10-12 12:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8cbb697c4e6e8d5f7ed4b4bd0b72c7b6 SHA-1: 5ccc686c6e5f4ba3e7e3945be7990ee88151f1b6 SHA-256: 29b07170efe81a9acd84f3b4ec00fe215459ff47e5eadc8ec93c16cef9ffe82e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm directing to numerous URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS links points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nasledie-sluck.by/var/upload/file/toloposafazudopinibafam.pdf In PDF document text
    • http://vako.vn/app/webroot/uploads/files/guwowe.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16165339542abf---82372836107.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/55687065836.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/siwofijetorobuz.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/likelirumokat.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/11087530600.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/zoxozemakokomixaxezo.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/rizovegijidewixixis.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/liwinavovufadu.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/besixezumovugenenojalepim.pdfIn PDF document text
    • http://gespk.com/userfiles/file/71867369816.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/rozenerubub.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/mefixem.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/85188164192.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/40254931753.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16163e77b94313---43674725011.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613062b552ecb---4898357014.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/50194509204.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630729110.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/fafuwupijabetidure.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/gomugumirotukape.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/6045262533.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/gimimikez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=garbage+romeo+and+julietPDF 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_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 10832 bytes
SHA-256: 995e0785c28daa9a358c3c6befdab10f1718c8c5628e3a4af82230dc4044cb81
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 17712 bytes
SHA-256: 33a4d9f75fbbbd8ac3fc41ecd4178554f7505139898e43bfc738f6f8c69ed229
font_02_sfnt_off00012a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1