Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9c9676a45bdeac…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 11:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1fb459af96e20da8cc9c5219081a10ea SHA-1: 31ba5a39e251cc104c23027385c2460e8a8a13ec SHA-256: eb9c9676a45bdeac4ee4d0a935c9affd98eea417ebfe854ad279d3911b64a9a2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=comic+book+creator+app+android PDF link annotation
    • http://hmsendo.pl/uploads/editor/file/82148048696.pdfIn PDF document text
    • http://sciattella.net/images/file/95378569919.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/teleremuku.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/66779339282.pdfIn PDF document text
    • https://vitanov.rs/files/golijalararag.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/44168794756.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/piretikawoboler.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/tojutejitaxiwewaro.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/bemafibuji.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/301273597.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/99127348484.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/vunuluzojusovon.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f40deb3f---molinafebowuroj.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/vufugeki.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/jinowu.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/rubum.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/33705529734.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1d7c12de---95887300367.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355836ac864---77327497488.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/45222824350.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7e31e63ca25fa83ef8b042f2f45b8f14/tumagekebidixukogex.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210917010118.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/ratipox.pdfIn PDF document text
    • 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_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 10724 bytes
SHA-256: a71e67d3432c6b5e442d11b64c1d117eee331cf33d3ff5e70211717257919ba4
font_01_sfnt_off000106bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 17440 bytes
SHA-256: 085fcf554b16be31f83a957eebab3dbcc0b10f8515d73511941952af032162be