Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da475cf54e20c7e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 05:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2911aa98ccde24fb6175ef766fd2f6be SHA-1: 520666eeddbb71720d8009db863e30504ed28640 SHA-256: 8da475cf54e20c7e7044b1845325251185e7334695ec0d3a3ccc2eb994dc4921
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://at-studio.tw/app/webroot/userfiles/files/20210826_003256.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/55e70216ba08009d064ec26095aec9ee/nufigezexakudukupisata.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce09efeb4ad---letuloto.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/56457041974.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/78305442387.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606d53f751b39---18934190218.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/50671820564.pdfIn PDF document text
    • https://magerp.org/upload/files/68179861293.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/93589612343.pdfIn PDF document text
    • https://mmszke.hu/files/file/53259426064.pdfIn PDF document text
    • http://lejuriste.ru/files/file/76984424028.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/tepufow.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/nugususumetoz.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612af07eb8bbf---41076209353.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/78121348593.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982aaec7ed8---xidetazidarogikelaro.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/84759946455.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/luxomizusojaj.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/65219034709.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/33956645518.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210820213605.pdfIn PDF document text
    • http://kag.fr/userfiles/file/ludapiralabozunuruvi.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a6a6da03c---zupebomidas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=vb+notes+pdfPDF 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_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 17364 bytes
SHA-256: 89b289d678f88f0dd5d737e85fca122e0ce988b9c02a1dc1b64ab35a4be64de6
font_01_sfnt_off0001155f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 10200 bytes
SHA-256: b141691c66cec67fefc302ead6c4a4d26b5e3b1e22182f295a20a4504cc1d84e

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