Malicious PDF — malware analysis report

Static analysis result for SHA-256 48adabb32bab16e5…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 23:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cf184a1a78708a964ecd474bbce8d3fd SHA-1: ead1c73d2b3346f3a1130b7f3828d3d52ce9a30c SHA-256: 48adabb32bab16e52dbbddbe9c0d909a185b44c3d9fe412984102b7f05d7d1c9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/41585548349.pdf In PDF document text
    • http://probeg2000.ru/files/userfiles/files/sasopila.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/kibisas.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/59862065010.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/kexemexuxamagelalavob.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ffc191cd095b5b84a69f1e3d2aaf8fa4/nunifulasizomup.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/97045516753.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/tefesodonupojojalanirov.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/zesarerilujatijuvenigow.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4c04e54f---jumaxobomilazedejup.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/77850523435.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/digafolofalemetusasote.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/91994848495.pdfIn PDF document text
    • http://topstec.com/d/files/73446788256.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210907032040.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130b25ca2180---54384733369.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/rosanegejuxis.pdfIn PDF document text
    • http://vkts.se/userfiles/file/67035475439.pdfIn PDF document text
    • http://bptramptour.pl/files/file/79082802505.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090706523916.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd3fa353dd---fonapawefofa.pdfIn PDF document text
    • http://palami.by/images/file/vumisutawulifob.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109070516288408.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-2/20210902010907936386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+calendar+providerPDF 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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 10288 bytes
SHA-256: 8b3fc356fe2511088b1a62ba6568d96f297f6caa159e980a19cd30dd6846610f
font_02_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 18764 bytes
SHA-256: b2f343c944853ecd4687d2c0b99b776744d38023e07b5c003bb67c3d1bfc31bc