Malicious PDF — malware analysis report

Static analysis result for SHA-256 6578f917500cf1b5…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 09:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba93fb8002a26911f95a9e3b72c24e92 SHA-1: 46529e8f3bda7e449c89464c09c87040bc8e6b69 SHA-256: 6578f917500cf1b5a9539b2697db9532df3bb716e4f37e12471450a914e399f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. The presence of a link farm pointing to compromised CMS uploads and disposable hosting suggests an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://przyklejki.pl/userfiles/wutetegudipemexize.pdf In PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e689a6476b---8844755329.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/96802873983.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/nabajefuj.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/19611469606.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/tagimiwal.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/88079268732.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ofj6mkhk55a89l3ludk0lsb359/73888667233.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/lixonanogadidesamatero.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/83832795521.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/mulibapexenumamo.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210904152031_l3wrtr.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/690bea93a3926c5469c38c6ffe0aaa24/26399554857.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/30039515421.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/45971225459.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/77906406544.pdfIn PDF document text
    • http://ifap.it/images/file/74114723039.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/71412223903.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/guropudamato.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/46305385496.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210906_17211BB38493E3E7.pdfIn PDF document text
    • http://aa-nusd.jp/89059834915.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/78082424545.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/novar.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3a5390e3859933e860ccfa66562e6be7/63444778856.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/selemuxuja.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/21823670681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dark+avenger+appPDF 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_off0000bc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1F 16524 bytes
SHA-256: bde69ba5f87f189c031526d50c5ce8cbd8794315c5153cf2ccb1856d26f37fd3
font_01_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 10060 bytes
SHA-256: 5142adba63f5d0ba1e428919192f97989f0220dc2748965a8bf538730c26efca
font_02_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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