Malicious PDF — malware analysis report

Static analysis result for SHA-256 6421b71cb9ca0b8b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 09:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1a1a21d2d881903660f32490e9512a3 SHA-1: 75501b69989ec06c03b234c5d9f3db273abcc863 SHA-256: 6421b71cb9ca0b8b176bcacade49667b0042a6edaea0798bd7c97279dc08b1e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to disposable or compromised domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it may leverage embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ww150004.linebot.net/upfile/files/20210912192959.pdf In PDF document text
    • http://edmo-cars.nl/images/file/28025112318.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b72944f72b48f87087347b12d08b5c56/95032677722.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/basibuzuredoja.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/96859747457.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/70694263369.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/74031792422.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/64183307323.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/86465382326.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/sijojapatokev.pdfIn PDF document text
    • https://angkalaris.com/contents/files/34638533589.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/12332216043.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/49298165337.pdfIn PDF document text
    • http://savemaxint.com/files/file/figuvedizawadexowedafi.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/60353740042.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/93947804423.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/wepitozazesegesabob.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/83645253424.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/29830569531.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/sunesu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2ffc4e697d74a8b8c5038e4797f3a839/94192605902.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/25617130630.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/zojugagulab.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/salutaviwifut.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327d5f894ed---sanikepupov.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/zewovozidiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=exploring+the+world+of+lucid+dreaming+stephen+laberge+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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 11476 bytes
SHA-256: 11cf36ca0b821ee16e754b5ad28ccde5536e61ff84b9e504653452773b89508e
font_01_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 17952 bytes
SHA-256: 8b6fce185edb05fd768c8ef9d017a32673d82e882d9df6893a948c54327d9e8b
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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