Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4f01376be21d20…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 19:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae52c601d69d59305fa546d80bc945da SHA-1: 72f88e9e1a565f776dd8324eaca5855b13f5c567 SHA-256: eb4f01376be21d2042ed582b47b752a99e8fc19c88e5230adf3e4c99d2c1b0a7
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 acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c303800e15841a0c229b67b2c6c16e04/sumuzebe.pdf In PDF document text
    • https://shevtsov-art.com/uploads/files/65159013032.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/pexemelozedopefa.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/toxatiliwaralozibedetunos.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/pepomidudopagikeruxej.pdfIn PDF document text
    • https://camphacement.vn/upload/files/madobazor.pdfIn PDF document text
    • https://bnovum.hu/downloads/tibujibele.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/dobekejubokuwojobit.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322763964cb---zirep.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/nilijasapejab.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/rivesesikidejirumef.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/xilasadozuwosevatusa.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xuwizenuzu.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/xemakokunaxezagubej.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/52100146694.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/2215625377.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/xesojotewimadavaji.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161422777b79f0---62830807893.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/66687726414.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2fe6a7a84---moxosa.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/23861408755.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/pexipirukebawofofezola.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/49259687240.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/54358274430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=steam+link+app+sony+tvPDF 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_off0000dbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 10660 bytes
SHA-256: 83f873c7e396a8593d44b6666b00d5802225db32ac0657bf16b7169672196e43
font_01_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 19824 bytes
SHA-256: e901a91d5e4ef8cd5805fc5808933cfd3b333d2d2b34b9a501fab19b29ca9ce5
font_02_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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