Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15fb9951c89603d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 21:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38c2230c5589d24489f58b325e4d1196 SHA-1: 57a0e236837cebff71fa5240d77bb77261ba5751 SHA-256: b15fb9951c89603d66fe56e6f9feef1d421e092737f1e17fdad7b45bfac01293
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://densayhongngoai.com/uploads/userfiles/file/42121930958.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ufum4281dv7rub2mdgvaqufrnc/mixitox.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/43703667629.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210905223350557772.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/63961890086.pdfIn PDF document text
    • http://industrialdevices.in/uploads/diselumomuduse.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/sewatituvagilu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431537ab780---77526065802.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/sadejeroxexirefagewalen.pdfIn PDF document text
    • https://duel.pl/userfiles/file/kudebi.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9dd68f724---27705879109.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb7fc4f61---tifevovuxarutizipipe.pdfIn PDF document text
    • http://schturman.ru/files/files/tivutipe.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/76089121207.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210913_155156.pdfIn PDF document text
    • http://siemreaptraveltours.com/userfiles/file/filulefe.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46410ad94---ditowebit.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613246d4a1b8c---96451477404.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/22366571347.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/00fc5307707477b0139b1076f1884c74/32455055166.pdfIn PDF document text
    • https://unitjaya.com/contents/files/30751939969.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/womuvazimimesasi.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/xatemizixutes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+a+timetable+app+androidPDF 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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 10692 bytes
SHA-256: b2d9bfcddd4763f0880699b00ebe8962e9a2722e67fc2f7ccca5b6ec73450c87
font_01_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 17044 bytes
SHA-256: 50a4f4d1275ca8ad85ca974b56a85de2c83f642c078976f92167b49e3190707f
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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