Malicious PDF — malware analysis report

Static analysis result for SHA-256 594d4ccad6ef30ce…

MALICIOUS

PDF

152.0 KB Created: 2021-07-15 11:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3165e744f6dbf23580890c81c737cdb9 SHA-1: ccbd9cff848f1e9c49834c565f1a80cc2e2af379 SHA-256: 594d4ccad6ef30cee40357f2782929a1c2570fb2d54fb785e2f0d3cd39b77bc7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are likely part of this distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://icsbc.ru/fuploader//file/giruviwewuw.pdf In PDF document text
    • http://chalappuram.com/userfiles/file/wopodiliz.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/77847363240.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb13321d98---pomanuzaz.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/tetamoredexezotomedijeg.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/vujos.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/13923defb4e9477e530537ef465f39bc/xejutibakakep.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/majemipebobulazemubirewe.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/32694952056.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/g1ogf9ct4o4cf0e56jue4ub3fv/66575837460.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/81802570258.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800bde461a6---42155177750.pdfIn PDF document text
    • http://esistore.be/userfiles/file/kirukajefalolali.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/perexeravaw.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2218bf2c1---wopekewedopukak.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe347ea970---43259824834.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b3dffcb2cbb0af44a837f79c63020aaa/58797562515.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/44be75ec9a88a6645c318341e9a69d43/nulinarabiw.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd0096d845---86331280851.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778f91004a9---nabovatumukopogiz.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/04944c849b27b12ffc6f8417948419b7/namifapinaxefidujiseleram.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/60vp0ko7pkg8v9i35uu1lriuuo/fivobufujir.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/48259201414.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f453cdb051---10380717337.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/puderorobajujoxuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hope+valley+fall+colorsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6a34634ad5f1e52f63793338cc8f8d14/pejuwalarokusasofubi.pdfIn PDF document text
    • 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_off0001f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CC2 17508 bytes
SHA-256: 8c3c61b01277b51c672aabd3368fe7a6a4548f6b5d214f3488d4dde175196200
font_02_sfnt_off00023ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23AC4 10352 bytes
SHA-256: f4465b1486acfdedc749a789d16c25870b946a43daf1c2a59a25321ed41dd038

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