Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f24951583aebac…

MALICIOUS

PDF

89.8 KB Created: 2021-07-07 09:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 84596e633766a3129f479cecfbe49be8 SHA-1: 1049d689cb98f7a9a59069c8aa3b6b3202d0fc6b SHA-256: 44f24951583aebacda109fd89b7fbf9ec4c6d7f473e47726363d37c196cc4499
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and a machine learning classifier. It contains numerous links to external PDF files, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://poorclarescork.ie/images/nasuberebe.pdf In PDF document text
    • https://nic-irq.com/userfiles/files/vavabum.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/4dsjbl93q7h9qavp134h94hr6m/58379933724.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b26ea6eea3---30422118249.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5aa47c67d97692f727f9962086445593/84163786786.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///55982030622.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/28926745095.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/xiwijapesopuluwed.pdfIn PDF document text
    • https://loctra.net/userfiles/file/jexiwiperanuzavonutu.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/mezogosi.pdfIn PDF document text
    • https://eternalbliss.net/file/pasuru.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c98fda8c515---52820545681.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/34912900704.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd42667ab6b---kuzogavezene.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729aad4edb---10111812554.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/38585813716.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/jogop.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085731c7c033---71027868999.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/9184330855.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/91890262183.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/visisexuzolebuwusiva.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/kidenopadejolosigip.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4cb220911d4d214bea1e7afde6253599/kebapiwodopivizonazexu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8f5a120b459e6709ac6b93eeb5a9ef61/17187832335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=you+too+can+become+an+ips+officer+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_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 16312 bytes
SHA-256: d7e3489518b37b51447e984601d4b59757f02e4ac983256af9333ca1a08b3c69
font_01_sfnt_off00012884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12884 10960 bytes
SHA-256: 10ffd597c85ea9c7609746e2874b8e42a8b20aa8481f3df7559f6c6313728eae
font_02_sfnt_off000141b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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