Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7b6f5041e50165…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 21:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 229c877462e94bfb72c567181111158b SHA-1: 222f4cbcb1788bc9b87f3fccaad6d1da17e0bae6 SHA-256: 0c7b6f5041e50165702197ff4945c1249f1bf9458652dcafb21ccda578720af3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing for credentials. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=multiplication+strategies+worksheet+pdf PDF link annotation
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee2964a574---tugixagar.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b940e0b76a5---bezow.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202108140609301155.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/8v9fbv1np6a8a8q53anea5ugfp/93956289093.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/doponipakola.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16123563ebcef5---pupunanelodaxagenanoge.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6cea9d0c70d4ca0238c6e16c5d1925b1/26357175408.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/57199204061.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1624927303.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/20114501684.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505001619.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8a238cf579296eaca6feeb137faf11c7/badegegogavupapixekonoba.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/u6l3ipjsd19dg6nim6mlsqvhd0/28830002911.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/13221404982.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/29587183407.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607638c9cd4d8---43452304575.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4lppdfb0k8n6r2m610aagi1l3t/64481126195.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/gisavepurabumarawinage.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/879a68e90e6e199a8efbb8de360dabc1/mevenekumu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2175e6406---xawigajanolufimerubi.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/kigekiwixonuvekuzaza.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c016b928---11066387801.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f7a58f5dd14cf2277214aa1faf9dacfd/10609958271.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/sepusilopiribevusiri.pdfIn 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://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_off0000d7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B6 11168 bytes
SHA-256: d785c0b32cefadf7b49c35776e39759bb6db98f67a43fb26d57abb20316e912d
font_01_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C0 18060 bytes
SHA-256: c33d389ed3a0a705bfacaca32aa22bf0638949d59eab2839c08bc88f9ed2666c

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