Malicious PDF — malware analysis report

Static analysis result for SHA-256 89205e4417e16cb9…

MALICIOUS

PDF

81.0 KB Created: 2021-08-27 16:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4846501fc4e900ffd48c00aa8054f047 SHA-1: 5cda8a6bdc4db0c29ed912dbfd0e9f7b19f09acd SHA-256: 89205e4417e16cb96c404e11c69c8a68dfec11b0faf5460a7432e46db2488686
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites hosting PDF files. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext, likely aiming to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b6ad149cd---vowavefidovibipu.pdf In PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/pejejudup.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/bonevewovumilegalusajadis.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/21179160530.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2daf01458---25917337124.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/xidebedo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a39b4e4ec---mumibuwivogevifiko.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/cjmg318h35bnetr0p2t8isg8d0/kajapotodif.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/56958685263.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/tozemukotud.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/4200973548.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/17411714901.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/073d0hg8ffekhob82kg5808q86/851681966.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce657b7329---19976407369.pdfIn PDF document text
    • http://www.celso.org/download/31073637645.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rkkpdgqol8fhn7jhtr3dki42op/vogol.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f07014d91e---46871403638.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/regokokagafojodiruz.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b60e2e6fd6---22083734373.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/92878589764.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/42002893950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=acca+f9+past+papers+and+answersPDF 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_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 17040 bytes
SHA-256: 3c97af1e36dbbab951a9eb856d04b97d72897239c4f88010c4a1faeb0e5865f9
font_01_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 10588 bytes
SHA-256: 139422409744682cf71dab08e8a218aaac791d3f7369f6fcd8083196f7038db7

Open this report in the interactive analyzer, or submit your own file for analysis.