Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa9c2f25ecb935e…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 12:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8888dc72c10ea49238799a79ce22fed SHA-1: 60a036161b2b4af562ba334883522521da783edc SHA-256: 4aa9c2f25ecb935e84bcd2e43658998907f65cc8a358e901976084171ae39ac3
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing attempt. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install remote support tools. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to trick users into compromising their systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://laborke.ru/uplcv?utm_term=ps3+remote+control+app+for+android PDF link annotation
    • http://fitnessklub-impuls.pl/uploads/assets/file/wukujobowafosolinem.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63ec0a394---mazisalinububaba.pdfIn PDF document text
    • http://vhshf.de/File/xiwewogu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8a092e271---862271392.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/78565955302.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/ronasimomipabalafabelekab.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5cb8e132aba5c2f4ab7571365f6b2fd1/lapofifopitaberotopozir.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/ropolodagadi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d594b1d8d6ab42227ee196dc69c1a0f8/94113364049.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f267751bbf8---ditemomomaravivebuteleko.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/medixinokigafonunenuk.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/razipudatofitidukag.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/ninelowegekesipumakonosa.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/91437388795.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/purasexo.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/65268134916.pdfIn PDF document text
    • https://thepainter.asia/upload/files/werebatejezasibugelewos.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1a271f883---3101658863.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/0b6ec34f2a3634d1885a4416f512252f/vetuf.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41353fc77---bigapipoxixikeje.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///6715244307.pdfIn PDF document text
    • http://nakatka.com/files/file/57813686035.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/62e60e43df04aeef8a3cffc018a47a43/gofisotebegirawaf.pdfIn PDF document text
    • 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_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 10956 bytes
SHA-256: 26173c4748d0fe8781e267a7bf7d3b198bccc12804b5c15706c784445d7ca043
font_02_sfnt_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 16636 bytes
SHA-256: 884f6c4d7426ccf82f617943bdfca5898f4bef51430d36dafbf7d512e6d20018

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