Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3ef451f43a1f23…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 10:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e04067160a081c8d79e5dcc82624896 SHA-1: 3b026e6db6a8300b4de51f0d96263bdf6acaae4e SHA-256: ff3ef451f43a1f23e62075d92061907b11683ea2eba741c1d656aa998534a6f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/zivisabipakebuked.pdf In PDF document text
    • http://belloverde.net/emailer/file/30504157629.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/luvivu.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/sumirejikijupuxor.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161400f2ac3c68---lifasezi.pdfIn PDF document text
    • https://thehouseproduction.net/file/93725244317.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/27578759759.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/57770951564.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210913113647.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/fowadomozobaneluno.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/fulederinizojada.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d625868ebb5f1e6f2a07e6c15c9ff1ee/nivolipepasinurafarize.pdfIn PDF document text
    • https://turbooto.vn/upload/files/riraloxo.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/57751653898.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/kenuguvuzem.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/mibomidigax.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/30893930702.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/zogisa.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3b4b01f1c4dd8b92f54b5c6fdbc86ac1/buwolemivimarelazug.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/tolizisesexuri.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/zikujoverejevixifesuru.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/43105980463.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/80993807231.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/daxokivepugegizu.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/gulavelokow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=total+no+of+apps+on+play+storePDF 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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 17952 bytes
SHA-256: de2346828c33dfe208b34b4af2d3e5f5a0bfd089bed4a1b31829c22f42643eac
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 10336 bytes
SHA-256: 7e8852b0d1bc4a798b4f4a9d9500d4824b551cf7376b5fa1fc6198a29b9b4ffb

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