Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c28307b16d656c6…

MALICIOUS

PDF

72.2 KB Created: 2021-09-09 08:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 533f37608a598cfff7bf7a39559a2e57 SHA-1: 03ef34d96edaf9c80d1cf6f190a40d0c543e746d SHA-256: 6c28307b16d656c6b4b5bb75994616e20852fdc8b8c906cadd5ccefd8511b8e1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's part of a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://angelojrobles.com/admin_initial_test/userfiles/file/88060391566.pdf In PDF document text
    • https://energooptima.hu/upload/File/zamesidobeduzuse.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/toginolekosesela.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/16940092424.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/kusanovobi.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/nididife.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/papova.pdfIn PDF document text
    • http://artospace.com/pics/file/60340103910.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/jiferovekale.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/wumoziteluxib.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/67822365684.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/33795501241.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/xisajiwijebewa.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/7217849775.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/56810892905.pdfIn PDF document text
    • http://1careglobal.com/upload/files/51669597473.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/80370868424.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/notegugubujelazojaki.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7791nhajhvonaq9vac6ifrcru0/mumopobikusinufinizeji.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/92394957953.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/j16o3g6psdt88ip8i4mq8o0kgm/98178138955.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/38538658018.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/fimeku.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161317a4be878e---76271590975.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/zuwososezolenaxox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pdf+viewer+for+pc+onlinePDF 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_off0000b8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D1 16976 bytes
SHA-256: 7f45d90e916caecc95302fa172f2ded95278c160e1b071eba480a58ce171136c
font_01_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 10336 bytes
SHA-256: d78e151ff2df0319f70fbc931dc3949ad5115ebbd678835e3c0a92ba1c62c3fc
font_02_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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