Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c05598c4eafdbd…

MALICIOUS

PDF

66.4 KB Created: 2021-06-19 09:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 06e10fa71d0a8d8127a82489710559c3 SHA-1: 7c05d230bf3a91664139658c5de94104e6d1463b SHA-256: 12c05598c4eafdbd7e1f336e930cc0dc826f08f106222fcf71df5da9f3f27cdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and other domains, likely to distribute further malware or conduct phishing. The embedded URLs and the PDF's structure suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=zone+of+the+enders+ps2+iso PDF link annotation
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098681da99a1---lafegopamugujatusewu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e625fdf88807bcbc9092e7749ac79738/80576426633.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/kuzadinanid.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/a7nb09eamkpqvrieier1fuogq0/12730111604.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/89355047377.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210525103857120.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607da7bc9e3a6---puzatazilurinuzipe.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2olif7fvtf5f6ar2ekh1hk6ulf/dugejosi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/79b09e3c2178b513799aafc6d6fc2314/89433726392.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/nabun.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5cb00f39---35534208948.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/zirutetevofesosovulesesuf.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/wiwatozolan.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f32dd329b8---medazabanuzalemolobeb.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c7a6d039---julojirugotozasevigo.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/7740812725.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35A 4976 bytes
SHA-256: 4cfc9c7b0da6b02836eb9c53f3ea1ded1af9910845b2a7ec8ee63d6e6afcfee0
font_01_sfnt_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 11808 bytes
SHA-256: f6eff1630cc341f3e31c65437c550299fed8d64fbecdddfc64caafbf0052ed6a