Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4818469d9e3b52…

MALICIOUS

PDF

86.8 KB Created: 2021-08-07 07:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a0089694f342aa48cb6b89d441049e5 SHA-1: 2e2a1d17f36392d3ffeccfc254323b5b260eb28c SHA-256: 1b4818469d9e3b52da56b76bbbfca021d2c2f249b880d11414c5ee3030f632a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm, with many distinct hosts, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with known phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/74733587890.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23ac4de50---wejubida.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/zanimevijitopamitup.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccd083bf4a---jurepusuvoxesilojuworus.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/aed068bb9a2cdc60452eb6d59091039c/fimoduw.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/malosadodijaresaw.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/81294224782.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ql7h1dvevu1ign521i8mp6dn52/26954992095.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/86525572545.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/nisetemofadeziruj.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/6e386cc17a8fce430bf50ad70d9cb801/nevuxofebosin.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/82918669167.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/53328520803.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/peniwofajemegekuzixa.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607757a3da3a1---pudagewasem.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/29514924254.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/49255488247.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/15507660624.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ec0992ea---vezapisase.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/78384136800.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/0e02d71ac4cbaeaff0187ea132d4dd48.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/lavabagojisekejazemone.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/aee1140c09487a5807dd9e2c350bed18/45756039256.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfde68d5635---rutusoxeliguwaxu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e5d5f27fa96896147167d89caf763517/kabig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=matematicko+fyzik%C3%A1ln%C4%9B+chemick%C3%A9+tabulky+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_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 19720 bytes
SHA-256: 4ab73c66d157d9927650c8881965951638403e5f0e1c1aced6de5dd201e78882
font_02_sfnt_off000130be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BE 11616 bytes
SHA-256: 9f78ce72a10999a6481e6e32a6c7427fdbf1711ead19956c7484a3bd322b7711

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