Malicious PDF — malware analysis report

Static analysis result for SHA-256 61eb546d875a2be9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-09 16:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 998a1b7258f7457a294f938d6b65edfa SHA-1: dea289a10026d5b806e673cee5fa9d1eb81cc27f SHA-256: 61eb546d875a2be9781e95ee132bb93fdc03e72e28513cdbef814dd4b258c762
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan intent. It contains numerous external links, several of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not directly executable in this context, further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=digestion+begins+in+the+stomach PDF link annotation
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/rafazixeli.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/pixubonujonomejum.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/91029904367.pdfIn PDF document text
    • https://ksboutlet.com/file/files/pinexasabedosi.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210905073156.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/75504278332.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/49991506472.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cfc830e231426b0daf72e2e0382c4072/jovopapesavafeler.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/zofofedurixubusovak.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/61712995276.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b9b679d85d24dcaeb88dfe2800d5437a/gezabop.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e488681b9---98934010498.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/61442818382.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398e5f91fd7---52118979640.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/zepuxiwad.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161340f2e9ef2b---mimiwivij.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/bakasomuvemakigolinip.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/fowazigijotodisepe.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/20142900284.pdfIn PDF document text
    • https://bfull.ru/uploads/files/duvufeponuniwuwatotunak.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/23879707542.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/pazarogukilotareduwu.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/79326374246.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/nudebibedujibogefefejaje.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/56161886907.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_off0000bb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB50 15436 bytes
SHA-256: eb780334a4d048c515d2b87f26d3dcb2cb2fd808201bc56c4ca39fa2fdd06a7a
font_01_sfnt_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 10672 bytes
SHA-256: d5212afb4b1a415a5dab8baaf6c53c6b6303caa048f32023fb41e3eb156beb7e
font_02_sfnt_off0000faae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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