Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0a22d9ca1e8dd9…

MALICIOUS

PDF

77.3 KB Created: 2021-08-12 11:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94920e5d864607dab5db8a08c70890cd SHA-1: a960a29f06b2b0dcb16da062d86e71308a2a29c2 SHA-256: 4c0a22d9ca1e8dd9090c5145fc49e3c760f4e45dea72eab4ff1623ae4e88e1bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://uctodane.cz/UserFiles/File/fafilivojokolara.pdf In PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96fa0dde3---32109353259.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/6547388343.pdfIn PDF document text
    • https://highrise.pl/file/6593638874.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078688bed84d---91606818691.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160be946f209f5---66283774011.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/40149319659.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/k0pbhr3og8h16vq8ir8d99ht6p/91736288134.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/44965757910.pdfIn PDF document text
    • https://www.oapublishinglondon.com/ckfinder/userfiles/files/zitevu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b513a27d5---zisexejewiwitupevekim.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/vekakik.pdfIn PDF document text
    • http://mebco.ru/images/file/80293417726.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/3651950218.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08da04656---fizuzomuwelot.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/abbd58eab64958b7619ee8eed2517f95/niperuxusifal.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/tarikojokuvutubadob.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/1vrf36j4bnki89cssj1b1avngn/88437767044.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/nitojowefivonuvugokux.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-25/20210625210624579242.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/37356229082.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/murexoworonorufonup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sadiku+elements+of+electromagnetics+7th+edition+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_off0000c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 16492 bytes
SHA-256: da9da5fbdc732e8c833b42d89f7e8614fac7640ecbc31fa8e8e4e7c11bbc7fe8
font_01_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 11384 bytes
SHA-256: 219a3a345eeb487745c74ab38c1a6a9609a51dda4c427fd98763ac1cb5bcf1a1