Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4c0f019729894e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-03 07:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8389cd888f647b8085ed0bba30db4eec SHA-1: 474619154231d3b9d8c0492a512f37817ccdb9bf SHA-256: cb4c0f019729894e513c2d90e3715058b8ed74ef19e7dc7338d497e0f6af5573
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution attempt.

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 https://publicbridge.pl/userfiles/file/21656669569.pdf In PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/3738529188.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160897cc85a4ba---tawuwibuwos.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/jipuveme.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/82162161412.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m9bq2krrv4gq0624bvq6tl08u0/fitupivunaxerarepusosunu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba43282056a---buwejumawelixa.pdfIn PDF document text
    • http://webornate.com/viking1/uploads/files/77213181263.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/wivuviwepes.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e144e152---39831657627.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/72487367479.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/beloromije.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/33149006350.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/33080580742.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/fd08ebb9f8f29448dcf7fc7aa7d12367/godasofapavavezutegepopum.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/mapanavuwoxunarazafibos.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/gesuxawu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/47f43cbab98b374fc1061bac9585b568/80239265473.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/bitovoro.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8a06b58287d65bb64ebe85a817afff08/39805910029.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/nogalomubajipel.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16125938395b6f---48508809150.pdfIn PDF document text
    • https://menu2uplus.com/images/file/42744420648.pdfIn PDF document text
    • https://www.lloydsunder30s.com/ckfinder/userfiles/files/40684779284.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6540a68031---24759192468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=asme+standards+for+valves+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_off0000ca8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8B 10616 bytes
SHA-256: 94a0dd90bf3605eda3fa018148942059f5fa7d40932e66c8198a052e68508d2b
font_01_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 15960 bytes
SHA-256: 7e810204e193cabe1ccb7e477b24233a8ef0de617a6ec9b51df36672eb0591da

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