Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1a1d0324d90a6e…

MALICIOUS

PDF

90.2 KB Created: 2021-07-20 20:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd3827f1f2484952d7cea8e1ace5575d SHA-1: 30d0c9ccce0802a28bbeb924a744cfa313ff2aff SHA-256: 8b1a1d0324d90a6e4151c55cf67103f3f7a51675a446e5416ef0bfb639ad31ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of numerous external links and the 'Urgency / deadline lure' heuristic suggest the document is designed to trick users into clicking malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://backkwang.com/userData/board/file/86116195608.pdf In PDF document text
    • http://forter.vn/hinhanh/file/45683083927.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/23386706676.pdfIn PDF document text
    • http://seamacros.com/upload/file/18006683466.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/144d0b9f8b381858877be2107c646b23/61403237995.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ee8910bdb---nezove.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/43164523862.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607323ccb2f5b---pakepimuzukotuwux.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/1de22d768d258952e9c7ff3a9fd2577f/13262760829.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a15ac2ad9646bf9b304e81911efaebcf/58863410301.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160af994628e8b---xodabuwibovomubedakis.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b858c5ce1a085840c5d72501063f34ae/12565841245.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/93264140455.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/90701840888.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49b67d5d0---kavudademi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae87681e1---xedewufalatabetuwefuzan.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/25796807884.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/g4eus8erjun5n6serqcb47cvqt/94021075471.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/43169357135.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///rovobun.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/tidis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=weekly+planner+onenote+templatePDF 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_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 10352 bytes
SHA-256: 0d97abe052db580078902f2bd4617ec2ce7b46e95f624b61f5dbaaa696b6ab2f
font_01_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 17616 bytes
SHA-256: 400e11eea9fcb52c55cdd848c9d0798f016d8656762222c9fb3231c473b5edaa
font_02_sfnt_off000143b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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