Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c38778b959a629…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 07:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9b98d77b8f696b657a8524e18d8b92d SHA-1: 86bb1b46a3ec138178a1fae40d9f84bcab54d20d SHA-256: c2c38778b959a6298aadfaaa8633b8f77cda77558dd5eb7e4a481377e714b27e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/888bd5eb1e204cac9ceb701817377a11/37871529019.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ade76f072---rabatonusufi.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/61437065245.pdfPDF link annotation
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e95a5c2d9b---lonekitejilapixajatogug.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/pafuxizoxusazagaxanimuv.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/dobuniwapininamikomoti.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/79660975221.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/liraxajevumivip.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/30460216088.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/11435331831.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sopepiwoma.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9f3ef7a9b311e6bcc9d024ae5b63e33c/36302729460.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/e16491443b3cf100ca0aeb2b01f35c73/48788337799.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a150630bb---79105865912.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073088ddd324---79706273238.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/fejanebogizusonuzevi.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbf2cb6d37---tipulukaserefowevakeb.pdfIn PDF document text
    • https://ahha.az/userfiles/file/faserekimanokirumurozajor.pdfIn PDF document text
    • https://davaocarrental.com/images/file/lewipokavolulopirusene.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd83abe229d---53741189879.pdfIn PDF document text
    • http://azizolace.cz/images/file/24485492903.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/zipulebakebabedagirupix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=lysistrata+pdf+sarah+rudenPDF 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_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 10600 bytes
SHA-256: 4e747d6715d5e12913a7afccbf28de8288aba9766e7a2358710331f79699b31f
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 17952 bytes
SHA-256: 3c8469f6d34ecb5d3004a3bcbce923b9713dc5dec69df998d735d44db424a160

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