Malicious PDF — malware analysis report

Static analysis result for SHA-256 477ed0d21823174e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-03 05:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e8f9a97739ff5ab1cd1cd3115b7c9189 SHA-1: 540b62886312c44cbb3cd53a37ea0fec107b072c SHA-256: 477ed0d21823174e918999c8ae77aaea0e937d6914ed8db2e7ea2fb9bdfa885e
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://petandpuppies.com/userfiles/file/sazufuxakunafuvumozal.pdf In PDF document text
    • https://kaptenhoki.com/contents/files/992864432.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/98087219209.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/jmmh94kubeo7ac3uablv3t4fc7/gisasizetibid.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/78899716389.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/71208572011.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/35842519004.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/73680429022.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/jigimes.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/98735407679.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/71897246906.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/xonapokafunatokesanol.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/zojotulapunadisaruten.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/lutaxowunapasegul.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b5b19859---zenedulusawetekadigipojid.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/12137959093.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/nobozimeko.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/83313841812.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/33dffe960094eb93365dee4ce0a0848e/38904029729.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac3bdd539---73226667642.pdfIn PDF document text
    • https://terracell.info/images/file/bineletixufuguwero.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d6bacefff---fetel.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/76316638375.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/62026335674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=teachers+day+anchoring+script+in+english+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_off0000c886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 19556 bytes
SHA-256: 89ca4c1fb5a45225fc36a8fc7d0af26b2d14e13e1ebf6afd9e4ee63b6ba8f97e
font_01_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 10976 bytes
SHA-256: 11743301f36aa48b42f3c16ed8819c21dc62239111d3f4dd8fb256ac90ee8fc3
font_02_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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