Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbe3eabac239fa7…

MALICIOUS

PDF

95.7 KB Created: 2021-09-01 09:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 615b87b72e338571c9dd79b23fecce9a SHA-1: 9ba0ee6cf5cb899c054a64d8ddd0c002597af8a0 SHA-256: ffbe3eabac239fa7fd8dadcc99a4842a77db611d430423a94ad2af63ca605d27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://lynxitservices.com/ckfinder/userfiles/files/kesizelikefuwum.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ej5mekev6jnc15fkkhofbln3ft/55942650572.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/41d8297869ff5441ff159b3ca3c6db79/buxuriwojodi.pdfIn PDF document text
    • http://kookwarenhuis.nl/app/webroot/files/userfiles/files/36863298821.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/fokorenerod.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/xonedesudatexamejawopibo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e61c8942d---94154838985.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/kufekasu.pdfIn PDF document text
    • http://abroadster.com/files/66786483098.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/91905997294.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2a1d3c734---xibejasor.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/sitiwigegaxijaz.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/vanisodaxuxumedudi.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19067e404---ripokemi.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/12116902934.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3c94ac4196ecb9bc4c17e0f335cabff9/23705499014.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c73f8c77632ee046874f5acf9fa95c6e/75286427379.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1e79e3fe1---26806124149.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc44c41cce---vuwav.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/zutusabazetu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7d5d2d8ef---mivedoniviputare.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/vubolirofupudeki.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/1958052008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=master+of+computer+applicationPDF 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_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 17488 bytes
SHA-256: 041be398e93dd2c6213e096bf6336d2f1fafe4e373a4cf0f516b90e87d4e8bb3
font_01_sfnt_off00013f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F86 10732 bytes
SHA-256: abd42cecc2dfc1e1fdf7d2a1328267110bcddc289f0d25904ea9834155c0a6f4
font_02_sfnt_off0001582d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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