Malicious PDF — malware analysis report

Static analysis result for SHA-256 b926a1e499eb0117…

MALICIOUS

PDF

102.4 KB Created: 2021-09-16 10:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66c35f7c8cadadcb048e52c5bea71d97 SHA-1: 950b9533a10ac7d689eaba74f1ae994d4a174374 SHA-256: b926a1e499eb0117be05053c0302070d21e18bfd436ec4b1b7e0effbb567332e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a link farm pointing to compromised CMS uploads and disposable hosting, disguised with a lure for 'minecraft app download pc'. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9459

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://beysukonaklari.com/ckfinder/userfiles/files/wewanewupuvelomim.pdf In PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/43550826284.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/73346990088.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/64091557573.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/19815662338.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/39301307768.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/45799166205.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401a682b6fe---39468715485.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/70fb7735f0634b277177442ee4854cd9/46499506641.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/kigalex.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/75475449539.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210907110006.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/femenijolozipo.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/40537139175.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/bubekoduwebara.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/sovezi.pdfIn PDF document text
    • http://timebymtm.com/upload/files/lodegara.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/31973549287.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-11/20210911185755805174.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/vipopobapudoxe.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/68193673122.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/74466524784.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/2cb5d9f25da78efde7b920e792b2f078/modom.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/71053921426.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/17712117028.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/9gtru180cd6m90gc9s5ostge00/kimekulavagowuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+app+download+pcPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 10524 bytes
SHA-256: 11ab81c8fe31ec38c05e9f62853caadf42b83107fb1dd8b17166673c0bf3d28b
font_01_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 26028 bytes
SHA-256: f10d95561516fa6a845ce89b44e73526bf80004e6728031c09cf6ba1009211c8
font_02_sfnt_off00014ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF1 17040 bytes
SHA-256: 4f97c5d08fb9d4b85e4e533131c79727bfba75d4070a9b7309fda995a41432b7
font_03_sfnt_off00016931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001813e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1813E 1996 bytes
SHA-256: c8b954a6c4b623f6d9c9809a7d6daa21356e8f399a05ea9813bdde4329f29e1f