Malicious PDF — malware analysis report

Static analysis result for SHA-256 9143edace4b094c2…

MALICIOUS

PDF

87.4 KB Created: 2021-08-07 05:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bf0ed80d3392ebf7e3d896cebcf6c0b SHA-1: 7d300163c42106bc672f3cc2e6610a56ba10f39c SHA-256: 9143edace4b094c2758bcba1ee128f23168cbd159f4362083e5d2c51dbb55838
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic findings of a 'link farm' and 'compromised CMS upload link farm' support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c304d2a0---xidekadotukes.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8121322ed---rakikis.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/76389664531.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/72947141102.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/fomirotudobo.pdfIn PDF document text
    • https://songhong.info/userfiles/file/58078288012.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/legubudajawesa.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/tijumodisojufekev.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/47303204997.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1c956f722329e956954d9ac47cbaee86/pagujawipe.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/pokogitefivugupav.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e29a5cdf5f7---2318256288.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/kom6cc90e80s3kr9759i5jgjch/30218799480.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b09a7f40b1b5320ae5a6090f5d73b563/26335225205.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a74432bd312---79809788914.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/81dfa0fb34b7b27902263aea175b497a/61992416234.pdfIn PDF document text
    • http://pasted-radio.de/web/files/nalilepalamigixej.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210629120603555.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/7173524037.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/82641618936.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/57924295548.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0p66hvcjtvilm2rji1li33sdaj/visiwufit.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3301b17f---22915201035.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/tusotivifuduran.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sonic+the+hedgehog+movie+coloring+picturesPDF 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_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 17500 bytes
SHA-256: 3136e9cbc93abc5dd799cf15b24820b4e85ca633b161d115667963400e5e1d10
font_01_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A5 11040 bytes
SHA-256: 6db6c1b2bc947e1c7bddd6eb01eaaba801327c09a6154e8faf621a049f1202ee

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