Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8172029da6742d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 21:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6dd36c4bd6fe940efbc453b6b6dea2b9 SHA-1: 9632a383a044833a1ad906c62d30eecc25261758 SHA-256: 4f8172029da6742d47627f5ecbb82ca7c1d2ea46044b3ef34c194ef638527068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://peter-crooks.com/userfiles/file/23839512802.pdf In PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/wawasuwug.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/gagamo.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/sinavonu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373ac74636e---63720337165.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/44430691924.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613610aa5f268---81238633644.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/38849271724.pdfIn PDF document text
    • http://ty-int.com/files/files/vorejebimabenimobosof.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/votakaxafomototupup.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koxifenitez.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/33350471917.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614294dd129b0---41558814153.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/dizifezezefonexixa.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161398408085ed---27560286357.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/53063318250.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/pinojinagopigoforofedifus.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/mupoxekavirisowetojiru.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210904104957872.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/58038356693.pdfIn PDF document text
    • http://aa-nusd.jp/49274712944.pdfIn PDF document text
    • http://fullx.net/files/zokusigu.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/76884111185.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/46803147681.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/bolomedizizejoga.pdfIn PDF document text
    • http://888chji.com/userfiles/files/ledejabixinasurenabaxix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+happy+new+year+movie+123mkvPDF 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_off0000cdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 11092 bytes
SHA-256: 3271deceea6d9d7c04038ecb2fa60281f84e87b5568d21edfa81a45bbd3db9f6
font_01_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 16740 bytes
SHA-256: a5eedf42a3a04e523391880953e0dab89504112473d4fc04f5e4e3e63dec6ce0