Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bdeac563900d39…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 02:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8ca6a11202bffe20cfc2727b137504c0 SHA-1: 7270166d40fdc0373af1a95b2da4f9feeb80c328 SHA-256: 49bdeac563900d39617efc5a1bb50f32599202b94009a40d2491ba536db787c9
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://csp-pub.com/stockages/files/fazoverozug.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097364db82c0---gakisuwegikaxobozitaga.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa2611074---xikivade.pdfIn PDF document text
    • http://beta-rc.com/upload/files/30827542864.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97567282796.pdfIn PDF document text
    • https://chpcentre.com/files/file/tinufikafegaduzexu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16083cdb022545---32467533862.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/jezetajasalobale.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/67987301708.pdfIn PDF document text
    • https://sinarwaja.com/account/files/18222823696.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/fewuninafowajiruk.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ce47e00ac---96194378314.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c958b82c969---fanepigutiviletudimizar.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/95684704066.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/07/28/suvezasibopirabuxut.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/levumoxano.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c15a2fe337b2693fa0d0ed0a1eaffab8/37538606609.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/80336356276.pdfIn PDF document text
    • https://defaico.com/d/files/99159294372.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ip5ctli9u7pmn1cu6qih0pd885/pipivilenukunegom.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/h90ca3n49kjfvuafcp5u5s2r2h/laponafaxizidevugizutej.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/sekasita.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/9636411596.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dmbids9df1sauluj8gc86fim45/48067084748.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e91628ed00---bejafinixifabaxuk.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/kimiwukuramejaboresix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=rampage+3+president+downPDF 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_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 10992 bytes
SHA-256: 605212cb5e2e8e18fdd71ca4c3a5a40eb6850d2c4dbcab9b8ef43b5a53fa820e
font_01_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 18872 bytes
SHA-256: 56a337ecbd3c91220b8d17ec7e42f14da9af8ced9737d0d278c649b92402a065
font_02_sfnt_off000127f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1