Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8a7385be8b31a4…

MALICIOUS

PDF

89.8 KB Created: 2021-09-18 03:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 346faae491b1229d6de20f24ed3f4999 SHA-1: 10f064d9a652496c0f05815161937e3487d54d16 SHA-256: 5e8a7385be8b31a4003f2cc4cfcbabca2d2685e5f0879597d3795b7a626f24ad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The PDF structure and link farm behavior are consistent with a malicious document designed to lure users to external malicious sites.

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 https://ganganagardentist.com/userfiles/file/murozutap.pdf In PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3651016969d85a3ed1469cffec00b374/98169263991.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/wolot.pdfIn PDF document text
    • http://getem.eu/files/file/79648919714.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/42438658660.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/geduzutofotejokevazal.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/51529229397.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613783f8bcb92---tigaxas.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/58440969407.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/lulamal.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/55399265989.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379aacbf537---77727460084.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/xedadaduvolujeramuxig.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/doluzularowogasodafitoxa.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/zezusosezofojapozagaja.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/xotokugekopomomorafe.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/fifibex.pdfIn PDF document text
    • https://onecre.com/images/content/files/69528594678.pdfIn PDF document text
    • http://chemicalengineers.ie/images/jotesikolonuxukal.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/pelulutov.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210914100138.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/74288872866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lge+android+mtp+devicePDF 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_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 22296 bytes
SHA-256: e930f64b08b5e6722ff042f1f15b14a8254d99f37fd1151065cd091b8c79f62d
font_01_sfnt_off000129b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B4 10668 bytes
SHA-256: 21b53eb456227bb28231fedaabb1c66bf66bb22d43a1fabee5ed697d7b5cd680
font_02_sfnt_off000141ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1