Malicious PDF — malware analysis report

Static analysis result for SHA-256 401b4483cc54701d…

MALICIOUS

PDF

84.8 KB Created: 2021-08-15 18:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1888df48b18751b779aa413db9119834 SHA-1: 55b44a3ec4c84f5159fba573978fecaf0ef1c934 SHA-256: 401b4483cc54701d317be33097a2f89b786e831033b884a83c1fc04dde39ba87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm designed to redirect users to potentially malicious content. No scripts were extracted, but the presence of numerous external links and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=alita+battle+angel+full+movie+download+mp4moviez PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f150b43e5---kebugogomibilawi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5dog751u8fjkhumk4pepbt8ig7/ritilabawuve.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/1100836242.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/84546374559.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210506063424.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d02015810e15d668efd02fd749c7275a/31141862148.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/dokekiwolarilo.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/lufotexorejexipibotozofa.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/mikijugagofefosegamemo.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d4d2b2ce1fd51f29defe91273c3707cc/tisusogajanubuwomawule.pdfIn PDF document text
    • http://tipiland.net/upload/file/torororexiso.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/11419a71667fa0eb938c86010d1bf56a/60243940682.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/bapixesowef.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a3e614d77---68789214925.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5725ecea8---kogifatufimevorilakavi.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/rusoserazebujomivevuzexuj.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/72086476244.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cca854225---55773596875.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/65832036282.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/28388504370.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/30de626685aacdad00d3c572d6155e77/tebake.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d8d47d40---88194831469.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/fitisoli.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/dbe6a4df456e8bc044ab18065de9e051/puvodawunevagaferir.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_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 11084 bytes
SHA-256: f8a01b3d0ca044a59e4dfc8c6ac816fbdadf0c734697c2253525151b69f8fcc1
font_01_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11935 16812 bytes
SHA-256: 4d451f43e4c81d2571105b07e963e1caaf357ab627453c7725018bf157a3b569

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