Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c8957687989c24…

MALICIOUS

PDF

75.2 KB Created: 2021-09-03 20:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a94d2d7c4a5aab729b40c1b72f9c2520 SHA-1: 070dae5e0c36811e30c5193d34d602309ae60796 SHA-256: 61c8957687989c24b2ea028715d5301c4dbda60d827414a58bc2eeccc779f4db
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely serve as a lure to direct users to malicious content, potentially leading to further exploitation. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131db369cae4---20335721863.pdf In PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/40768278700.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/93586094768.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/37896899236.pdfIn PDF document text
    • http://www.heksan.com.pl/file/31635093180.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609209f8126b6---bogasujojokik.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/guwutuma.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd8c05ae8---8617600376.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/12203233988.pdfIn PDF document text
    • http://boxethai38.com/upload/file/99583553463.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/pitutomusokovufevexalo.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/raxuvowabe.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcba27bb13---66588251622.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9faefb0ae4---76231054364.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/14126481136.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/sisosujizava.pdfIn PDF document text
    • https://777mto.com/contents//files/katavogiwikerap.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/46569144100.pdfIn PDF document text
    • http://aymfly.com/aym_image/files/forepozowujev.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/jigosa.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/13923171572.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f4d297476ee12e513316075dac703e67/93104380008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=anemometro+digital+portatil+manualPDF 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_off0000b85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85C 10648 bytes
SHA-256: 972a2babe1e805f8a11525dacc3311ec21c4d18c1bd747e2b69d7e84adcffcf7
font_01_sfnt_off0000d078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 20552 bytes
SHA-256: c3eb0d765feaebf7e79bc90f8f579bbc456bf178e644de0d5a18d557a7bc470e