Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8441a5a0974d377…

MALICIOUS

PDF

92.9 KB Created: 2021-07-24 15:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 93b6bc1465e659c5f69dd0c843eb648b SHA-1: c3ed75fd611e2b4548fa527f6d8801dfdf240f2f SHA-256: f8441a5a0974d377ea8d4e1b8c299dab2f7e65e4e19f068c6e6d6ae8abf51a67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of numerous external URIs and link farm heuristics suggests an attempt to distribute malicious payloads or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b39dcd88dfa0a70b83de4c16946c11dd/62627057754.pdf In PDF document text
    • http://maciejabramowicz.pl/upload/files/file/22938135483.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c2481b78---barudomitazazedijan.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/lutopogogoto.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/89551787016.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5e4120dd9---zogujinalalikipufema.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2ueioojlteki9294vlfs9u410r/99753890670.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/50434935743.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6qu54m32mgmvt8f3rspv8m9cs7/85657235050.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b645656f2ce---69157870741.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/87077761299.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/ziwopu.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210723_143430.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3fe7be695---40868877331.pdfIn PDF document text
    • http://dsagco.com/Upload/file/10423174091.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/domaxijejuvusemebifubig.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/nexamowenetaguwugukapaso.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/febimu.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/jedosawutan.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/258a4fb1dda4bf493376de00402b1cb6/36124530854.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160706cb5ab2b2---sufijajedubek.pdfIn PDF document text
    • http://renknh.com/ckupload/files/5062446754.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/sokagikebefab.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/e0r2i8g2c6ftdsh1fo5jcnj333/nelegewirasumizokivogebo.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/jikore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=planisferio+con+divisi%C3%B3n+pol%C3%ADtica+y+nombres+para+imprimirPDF 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_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 17840 bytes
SHA-256: 340da72d6176cfb3756928e723d870c1535e3aab04efaa7f6faa003b395d7bd0
font_01_sfnt_off00012f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 11304 bytes
SHA-256: c8bb2bd5f72ba047ef05355c328dc107e8be384e2a8cae784c13872b8f2c052f
font_02_sfnt_off0001494f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1