Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2a22f7f56ec386…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 15:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3dfdd278ca81e3ef27b0971ad402af7e SHA-1: 32df02c10ab3fbef88f81218d74c1d8726f8632b SHA-256: 4a2a22f7f56ec3869d2b01744c2faa1b3f099d775bd698ce992671343202b2d1
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rocincorporated.com/domain.com/images/dynamic_pages/file/44187227763.pdf In PDF document text
    • https://tanasiri.com/piceditor/file/nezatikegixel.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ut5sn5ucbl4fljl2o0f19f3fco/fakub.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/7580677793.pdfIn PDF document text
    • https://paperland.bg/uploads/file/88966274537.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/tawaw.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/tosisuwonusisozave.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/72035414561.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/viredip.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/darumotexefamujeto.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6061157809305b06c60dfa50e2dd18fc/novefewonisesep.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/feguwutetezunizudakuni.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/lepazunozakab.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/dobonujiloparuziluz.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202189756433337.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca0d564e4---46168221359.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/virodixusajatofuxofakake.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/948fe4d6eedd42dfa73d6fc5ea44b7fd/tovapomo.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/wubosexesunalopaxe.pdfIn PDF document text
    • http://qdjshg.com/files/file/selolobodubobatavebemogu.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/57417296518.pdfIn PDF document text
    • https://jambukuning.com/contents//files/nezurogebikuxufanilokaxos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=kt+tape+knee+pain+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_off0000fdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 17384 bytes
SHA-256: cf5f72bf78c5c74e039469b406867a7c2dfaf0752c10e2857b58ced8ab48c4b5
font_01_sfnt_off00012a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14288 10140 bytes
SHA-256: d26c6feda32a459a02c42b4d36e5034eb69a6bc526f3f9feb6b6a58ba85b2faf