Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e33e4c84b279b9…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 02:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d450f197170e5bbcfff9cb8ec162fef2 SHA-1: 77bdc3355b01bd6298111073676ed9ab997f6a1d SHA-256: 12e33e4c84b279b96e33d1f0d92b274f09c2c4f914ce8c4ab3721f765dbe6b4d
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 trojan. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the detection as a trojan indicate a high likelihood of malicious intent, possibly involving the exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.bmo-agencement.fr/ckfinder/userfiles/files/zemewaxewikamewi.pdf In PDF document text
    • https://prawobrzeze.info/userfiles/file/89770534648.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/2327287393.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/jejaxapodu.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/96216793569.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ff5c39d191f---7843026123.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/wapesi.pdfIn PDF document text
    • https://tessuno.com/upload/files/60cf923f1356b.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286abd378a---45433165437.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/v99c4g8lsucno4pomsl8uh9q87/95327158581.pdfIn PDF document text
    • https://jobtiara.com/files/files/sijibomufefasa.pdfIn PDF document text
    • https://85097781.com/upload/files/vagoxoguwubitamix.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/9aa3f7473a1603b6d0350c672ed1e5ef/37207527967.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de88dfdc2e0---rimopirupopadusuvutokosob.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/4980367082.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/74277704841.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e158dd147---88306702659.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7ab70409---dozawitusalixeki.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/gategusaro.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4ef7b7145546afb3db83eacf7a2cc83/xozovotilizozumon.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/79589614616.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/75788408978.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/jekofovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=calories+in+a+cup+noodlePDF 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_off0000bebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBD 10540 bytes
SHA-256: 431b7f8b5de22846f6b4a88b64a84f0fc21b6aed628852e1be4cbd8cef15d134
font_01_sfnt_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 16212 bytes
SHA-256: 0a40bb594c56d0133145e55c598e890eb8a971d8093814de34de4ad41652112b
font_02_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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