Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd6256b41930349…

MALICIOUS

PDF

207.5 KB Created: 2021-09-05 09:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b70fac36bc25bec1b3896e26d1dbfda SHA-1: 57a090b88cb991e6cfb86f4e1d0a127054aebca5 SHA-256: 3bd6256b4193034967904f7d2c2022873f5b01e8db3b845ecbc5b4e1d49589de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of a link farm pointing to a compromised WordPress upload directory suggests an attempt to distribute further malicious content. While no scripts were extracted, the PDF structure and heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 5

  • 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.
  • 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://geoman.cz/data/file/zubum.pdf In PDF document text
    • http://edu-family72.ru/content/images/uploads/file/gerenelutizir.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/c4508da3c5fd53717579907cfb8eb910/maxofenupamudimezit.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/24593320622.pdfIn PDF document text
    • https://petikdaun.com/contents//files/62547881840.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b16deaf2a8---mipumizudera.pdfIn PDF document text
    • http://topas.lt/userfiles/file/sulejisuxe.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609822302d674---dusubigolevufu.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3c745543730af87ad77750453fcb8a6f/xajexaximige.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/zutijazeboxabi.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4h77jrg7a7neo6lqucjk67u319/18550127907.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/fotusogepegipa.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/28386151726.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/gevigeparigalaxe.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/2028562038.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/47954017803.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/kajekibodiwije.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096901e7360a---duwofekojosibeludozome.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/59124340071.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vrt9ji5rnr1n5lb0lg5vvkqtg2/mowegoguf.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/88371279878.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957124821d5---rafajosibobupetupufimut.pdfIn PDF document text
    • http://allasclub.com/campannas/file/webuvetapalefemebinas.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/06/20210612142714.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/44c675d3d19cf02371f75db91f45e900/70107678205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=aksum+an+african+civilisation+of+late+antiquity+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_off0002c63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C63C 11280 bytes
SHA-256: 5b191eb586b2809cf6b74069719186da53e6334e9a9c13113eec7b4edf671991
font_01_sfnt_off0002e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F8A2 20932 bytes
SHA-256: c5531eb8e4a3f645d189d7516dcbfb851fea20c2c2a893fa33322bcf2c9f69a8