Malicious PDF — malware analysis report

Static analysis result for SHA-256 4392b4d9c3cc6e52…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 09:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6c3012e123268e5efe3222aeb7f799f0 SHA-1: 6edf1c208c75b94098de3a5eb07bc78164c1276c SHA-256: 4392b4d9c3cc6e52b2b46108fb658ab04f928ffabebc86ece01cef52f0cf387f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs further supports this, likely serving as lures for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e98596993e---38311608154.pdf In PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142046f88481---baforizin.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/46002345216.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303da160b5a---nekugivitow.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/59210603619.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/85652313348.pdfIn PDF document text
    • https://citronel.com/userfiles/files/61312893779.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/tilufulagewalokelarigake.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091711183172175.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/36862168064.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/66931602218.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/39089049800.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/40634471457.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/75780868913.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/92610527043.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144113c2dd48---67126362886.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/43868247172.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e62813c0915dbd4fbdf1ae5440221f6a/zibigezenigabososib.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/14124036499.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210904_77844A33A10A7696.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/43d2e2f1173e723fd97aab7dfb03dfbc/55196671133.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614147a158dc4---jitosapulolozabeloxalejo.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-4/20210904185012391720.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/55895a9a2d8db77b755b7df3daf9e89b/63011645154.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/26880177478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=alexa+on+android+tvPDF 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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 10224 bytes
SHA-256: f4cdbeb2a1416898405f006fad30b8d6f55f00dbce2a4b06208dbe241278a94e
font_01_sfnt_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 17692 bytes
SHA-256: 1f813248bb87047a11904bbd5b0ed9ccb9ef86ccae633c9526c1c6c7c52a41db
font_02_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1